function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}


function cchange(id, index){
	var elm = document.getElementById(id);
	if (window.XMLHttpRequest)
	{// code for IE7+, Firefox, Chrome, Opera, Safari
	  xmlhttp=new XMLHttpRequest();
	}
	else
	{// code for IE6, IE5
	  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange=function()
	{
		if (xmlhttp.readyState==4 && xmlhttp.status==200)
		{
		  elm.innerHTML=xmlhttp.responseText;
		}
	}
	xmlhttp.open("POST",'src/cchange.php',true);
	xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	var dotaz="chcar="+index+"&id="+id;
	xmlhttp.send(dotaz);
}