// display zmeneno na block, misto inline (pouzito v hudba na texty)
function display(a,b) {

	if(document.getElementById(b).style.display!='inline') {
		document.getElementById(a).style.display='none';
		document.getElementById(b).style.display='block';
	} 
}


function prepni(a,b) {

	if(document.getElementById(b).style.display!='inline') {
		document.getElementById(a).style.display='none';
		document.getElementById(b).style.display='inline';
	} 
	else {
		document.getElementById(a).style.display='inline';
		document.getElementById(b).style.display='none';
	}

}

function getElementsByClass(node,searchClass,tag) {  
     var classElements = new Array();  
         if ( node == null )  
             node = document;  
         if ( tag == null )  
             tag = '*';  
     var els = node.getElementsByTagName(tag); // use "*" for all elements  
     var elsLen = els.length;  
     var pattern = new RegExp("\\b"+searchClass+"\\b");  
     for (i = 0, j = 0; i < elsLen; i++) {  
          if ( pattern.test(els[i].className) ) {  
          classElements[j] = els[i];  
          j++;  
          }  
     }  
     return classElements;  
}  
   
function hideByClass(theClass) {  
     var el = getElementsByClass(document,theClass);  
     var elLength = el.length;  
     for (i = 0; i < elLength; i++ ){  
         el[i].style.display = "none";  
     };  
   }  
function showByClass(theClass) {  
     var el = getElementsByClass(document,theClass);  
     var elLength = el.length;  
     for (i = 0; i < elLength; i++ ){  
         el[i].style.display = "block";  
     };  
   }  

function setZindex(theClass) {  
     var el = getElementsByClass(document,theClass);  
     var elLength = el.length;  
     for (i = 0; i < elLength; i++ ){  
         el[i].style.zIndex = 50;  
     };  
   }  

function Jump(line,TextArea) {
  var ta = document.getElementById(TextArea);
  var lineHeight = ta.clientHeight / ta.rows;
  var jump = (line - 1) * lineHeight;
  ta.scrollTop = jump;
}


function JumpTop(TextArea) {
  var ta = document.getElementById(TextArea);
  ta.scrollTop = 0;
}

function TextShowButt(ShowText, ShowPolaroid) {
  hideByClass('textT');
  display(ShowText, ShowText);
  JumpTop('areaSongText');
  setZindex('all_polaroid');
  document.getElementById(ShowPolaroid).style.zIndex=80;

}