var problemsOnPages = new Array(
		[1,"opakovani.html"],
		[69,"limity.html"],
		[149,"derivace.html"],
		[217,"lhospitalovo-pravidlo.html"],
		[247,"prubeh-funkce.html"],
		[284,"aplikace-dif-poctu.html"],
		[295,"diferencial.html"],
		[314,"zakladni-integracni-metody.html"],
		[347,"integrace.html"],
		[363,"specialni-integracni-metody.html"],
		[405,"integral.html"],
		[436,"aplikace-int-poctu.html"],
		[459,"#"]);
/* Problem searching is based on this array. Sorting on problem's number is necessary */


function showProblem(id,headdiv) {
  if (document.getElementById(id).style.display == 'block') {
    document.getElementById(id).style.display = 'none';
    headdiv.getElementsByTagName('span')[0].innerHTML = '» Zobrazit zadání «';  
  } else {
    document.getElementById(id).style.display = 'block';
    headdiv.getElementsByTagName('span')[0].innerHTML = '» Skrýt zadání «';
  }
}

function showSolution(id,headdiv) {
  if (document.getElementById(id).style.display == 'block') {
    document.getElementById(id).style.display = 'none';
    headdiv.getElementsByTagName('span')[0].innerHTML = '» Zobrazit řešení «';  
  } else {
    document.getElementById(id).style.display = 'block';
    headdiv.getElementsByTagName('span')[0].innerHTML = '» Skrýt řešení «';
  }
}



function showAllProblems(zfrom,zto,rfrom,rto) {
	var headProblems = getElementsByClassName('priklad-hlavicka');
	
  for (i=zfrom;i<=zto;i++) {
		showProblem('zadani'+i,headProblems[i-zfrom]);
	}    
  
  // changes texts and classes
  elementVse = document.getElementById('odkaz-vse');   
  elementZadani = document.getElementById('odkaz-zadani');  
  elementReseni = document.getElementById('odkaz-reseni');
  if(elementZadani.className == "switchoff") {   

  	   buttonSwitching(elementZadani,"switchon","Sbalit <strong>zadání</strong>");
         
     if(elementReseni.className == "switchon") {
     
       elementVse.onclick=function(){hideAll(zfrom,zto,rfrom,rto);};  
       buttonSwitching(elementVse,"switchon","Sbalit <strong>vše</strong>");
     }    
          
  } else {         

  	   buttonSwitching(elementZadani,"switchoff","Rozbalit <strong>zadání</strong>");
  	 
     elementVse.onclick=function(){showAll(zfrom,zto,rfrom,rto);}; 
     buttonSwitching(elementVse,"switchoff","Rozbalit <strong>vše</strong>");
     
  }       
  
}




function showAllSolutions(zfrom,zto,rfrom,rto) {
	var headSolutions = getElementsByClassName('reseni-hlavicka');
	for (i=rfrom;i<=rto;i++) {
		showSolution('vypocet'+i,headSolutions[i-rfrom]);
	}      
   
  // changes texts and classes
  elementVse = document.getElementById('odkaz-vse');   
  elementZadani = document.getElementById('odkaz-zadani');  
  elementReseni = document.getElementById('odkaz-reseni');
	
	if(elementReseni.className == "switchoff") {   
	   
  	   buttonSwitching(elementReseni,"switchon","Sbalit <strong>řešení</strong>");
         
     if(elementZadani.className == "switchon") {

  	   elementVse.onclick=function(){hideAll(zfrom,zto,rfrom,rto);}; 
  	   buttonSwitching(elementVse,"switchon","Sbalit <strong>vše</strong>");
 
     }  
     
         
  } else {         
	     
  	   buttonSwitching(elementReseni,"switchoff","Rozbalit <strong>řešení</strong>");

  	 elementVse.onclick=function(){showAll(zfrom,zto,rfrom,rto);};
	 buttonSwitching(elementVse,"switchoff","Rozbalit <strong>vše</strong>");
  }     
}

// Change ClassName and innerHTML to some element
function buttonSwitching(elementToChange,classNameToChange,textToChange) {
	elementToChange.innerHTML = textToChange;     
    elementToChange.className = classNameToChange; 
}


function showAll(zfrom,zto,rfrom,rto) {

     // changes texts and classes     
     elementVse = document.getElementById('odkaz-vse');   
     elementZadani = document.getElementById('odkaz-zadani');  
     elementReseni = document.getElementById('odkaz-reseni');
     if (elementVse.className == "switchoff")  {
  	   
  	   buttonSwitching(elementVse,"switchon","Sbalit <strong>vše</strong>");
  	   buttonSwitching(elementZadani,"switchon","Sbalit <strong>zadání</strong>");
  	   buttonSwitching(elementReseni,"switchon","Sbalit <strong>řešení</strong>");

     }                            
     
	var headProblems = getElementsByClassName('priklad-hlavicka');
	for (i=zfrom;i<=zto;i++) {
		//showProblem('zadani'+i,headProblems[i-zfrom]);
		
		document.getElementById('zadani'+i).style.display = 'block';
    	headProblems[i-zfrom].getElementsByTagName('span')[0].innerHTML = '&raquo; Skrýt zadání &laquo;';
	}
	
	var headSolutions = getElementsByClassName('reseni-hlavicka');
	for (i=rfrom;i<=rto;i++) {
		//showSolution('vypocet'+i,headSolutions[i-rfrom]);
		
		document.getElementById('vypocet'+i).style.display = 'block';
    	headSolutions[i-rfrom].getElementsByTagName('span')[0].innerHTML = '&raquo; Skrýt řešení &laquo;';
	}
	
	elementVse.onclick=function(){hideAll(zfrom,zto,rfrom,rto);};       

  
}


function hideAll(zfrom,zto,rfrom,rto) {

      // changes texts and classes           
     elementVse = document.getElementById('odkaz-vse');   
     elementZadani = document.getElementById('odkaz-zadani');  
     elementReseni = document.getElementById('odkaz-reseni');
     if (elementVse.className == "switchon")  { 

	   buttonSwitching(elementVse,"switchoff","Rozbalit <strong>vše</strong>");
  	   buttonSwitching(elementZadani,"switchoff","Rozbalit <strong>zadání</strong>");
  	   buttonSwitching(elementReseni,"switchoff","Rozbalit <strong>řešení</strong>");

     } 
     
	var headProblems = getElementsByClassName('priklad-hlavicka');
	for (i=zfrom;i<=zto;i++) {
		//showProblem('zadani'+i,headProblems[i-zfrom]);
		
		document.getElementById('zadani'+i).style.display = 'none';
    	headProblems[i-zfrom].getElementsByTagName('span')[0].innerHTML = '&raquo; Zobrazit zadání &laquo;';
	}
	
	var headSolutions = getElementsByClassName('reseni-hlavicka');
	for (i=rfrom;i<=rto;i++) {
		//showSolution('vypocet'+i,headSolutions[i-rfrom]);
		
		document.getElementById('vypocet'+i).style.display = 'none';
    	headSolutions[i-rfrom].getElementsByTagName('span')[0].innerHTML = '&raquo; Zobrazit řešení &laquo;';
	}
	
	elementVse.onclick=function(){showAll(zfrom,zto,rfrom,rto);};
	
}




function getElementsByClassName(classname, node) {
    if(!node) node = document.getElementsByTagName("body")[0];
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
    if(re.test(els[i].className))a.push(els[i]);
    return a;
}


/*######## vyledávání ###########*/

function manageFindProblemNumIN() {
	if (document.getElementById("zadat-priklad").value == "Vyhledat příklad") {
		document.getElementById("zadat-priklad").value = "";
		document.getElementById("zadat-priklad").className = "inputText";
	} 
}

function manageFindProblemNumOUT() {
	if (document.getElementById("zadat-priklad").value == "") {
		document.getElementById("zadat-priklad").value = "Vyhledat příklad";
		document.getElementById("zadat-priklad").className = "helpText";
	}
}



/* Find, focus and expand problemNum. It can by call with no path parameter */
function findProblem(problemNum,path) {
	if (!isNaN(problemNum)) {
		problemNum = parseInt(problemNum,10);
		if (problemNum == 0) {
			alert("Příklad číslo 0 nebyl bohužel nalezen.\nSbírka tento příklad neobsahuje.");
			return;
		}
		var pageName = findProblemPage(problemNum);
		if (pageName != "nenalezen") {
			if (-1 != location.href.indexOf(pageName)) {
				var allDivs = document.getElementsByTagName("div");
				for (i=0;i<allDivs.length;i++) {
					if (allDivs[i] == document.getElementById("zadani"+problemNum)) {
						document.getElementById("zadani"+problemNum).style.display = 'block';
						allDivs[i-1].getElementsByTagName('span')[0].innerHTML = '&raquo; Skrýt zadání &laquo;';
						break;						
					}
				}
				location.href = "#zadani" + problemNum;
				window.scrollBy(0,-30);
			} else {
				
				if (path == undefined) {
					location.href = pageName + "#zadani" + problemNum;
				} else {
					location.href = path + pageName + "#zadani" + problemNum;
				}
			}
		}

	} else {
	 alert("Nezadali jste číslo příkladu.\n\nZadejte např.: 3, 25, 218, …");
	}
}	

/* Find page with problemNum, return page name with problem */
function findProblemPage(problemNum) {
	for (i=1;i<=problemsOnPages.length-1;i++) { // hledám stránku, na které příklad je
		if (problemNum < problemsOnPages[i][0]) {
			return problemsOnPages[i-1][1];
		}
	}
	alert("Příklad číslo " + problemNum + " nebyl bohužel nalezen.\nSbírka pravděpodobně tento příklad neobsahuje.");
	return "nenalezen";
}


/* Focus and show the problem if it is declared in address bar (=> "#zadani123") on load the page */
function initView() {
	if (location.href.indexOf("#") != -1) {
		var elementID = location.href.split("#"); // elementID[elementID.length-1]
		var allDivs = document.getElementsByTagName("div");
		for (i=0;i<allDivs.length;i++) {
			if (allDivs[i] == document.getElementById(elementID[elementID.length-1])) {
				document.getElementById(elementID[elementID.length-1]).style.display = 'block';
				allDivs[i-1].getElementsByTagName('span')[0].innerHTML = '&raquo; Skrýt zadání &laquo;';
				break;						
			}
		}
		location.href = "#" + elementID[elementID.length-1];
		window.scrollBy(0,-30);
	}
}

/*#############################################################x*/    
/*######################## POSUN OVLÁDÁNÍ #####################x*/
/*#############################################################x*/




 	  var menuHeight;      	
		var flowBlockHeight;
		var scrollingTrigger;
		var fixed = false;
		
    window.onload = function init() {    	
      initView();
      menuHeight=document.getElementById("menu").scrollHeight;
      //var menuHeight = 760;
			flowBlockHeight = document.getElementById("swmaster").scrollHeight;
			//scrollingTrigger = menuHeight + flowBlockHeight;  document.getElementById("swmaster").style.marginTop   + document.getElementById("head").scrollHeight
			scrollingTrigger = 220 + menuHeight + document.getElementById("swmaster").style.marginTop;
			setFlowBlock();
		}  		
		
		// to achieve right current offset when reloading 
		window.onscroll = function () {     		
			setFlowBlock();		
    } 
    
    
		
    function getScrolled() {
  			var scrolled = 0;
  			if( typeof( window.pageYOffset ) == 'number' ) {
    			//Netscape compliant
    			scrolled = window.pageYOffset;
  			} else if( document.body && document.body.scrollTop ) {
    			//DOM compliant
    			scrolled = document.body.scrollTop;
  			} else if( document.documentElement && document.documentElement.scrollTop ) {
    			//IE6 standards compliant mode
    			scrolled = document.documentElement.scrollTop;
  			}
  			return scrolled;    
		}
		
		
		function setFlowBlock() {     		
			if ( !fixed && (getScrolled() > scrollingTrigger)) {
        document.getElementById("swmaster").className = "positionFixed";        
				fixed = true;  
			} else if (fixed && (getScrolled() <= scrollingTrigger)) {
        document.getElementById("swmaster").className = "positionNormal";              
				fixed = false;  
			}  
		
    }