var resizeObject=null;
var okno = null;

function getElementbyClass(classname){
 var inc=0;
 var customcollection = new Array();
 var alltags=document.all? document.all : document.getElementsByTagName("*");
 for (i=0; i<alltags.length; i++){
   if (alltags[i].className==classname) {
     customcollection[inc++]=alltags[i];
   }
 }
 return customcollection;
}

function hideClass(classname) {
	var tags=getElementbyClass(classname);
	for (var i=0;i<tags.length;i++) {
		tags[i].style.display="none";
	}
}

function showClass(classname) {
	var tags=getElementbyClass(classname);
	for (var i=0;i<tags.length;i++) {
		tags[i].style.display="block";
	}
}

function showId(elementid) {
	var element=document.getElementById(elementid);
	element.style.visibility="visible";
	element.style.display="block";
}

function hideId(elementid) {
	var element=document.getElementById(elementid);
	element.style.visibility="hidden";
	element.style.display="none";
}

function switchIdDisplay(elementid) {
	var element=document.getElementById(elementid);
	if (element.style.visibility == "visible") element.style.visibility="hidden";
	else element.style.visibility="visible";
	if (element.style.display == "block") element.style.display="none";
	else element.style.display="block";
}

function openWindow(destination,name,w,h) {
 if (!w) w= 400;
 if (!h) h= 400;
 // window.open("openWindow.php","mytg",'toolbar=0,location=0,scrollbars=0,width=120,height=120,resizable=0,top=0,left=0');
 LeftPos = (screen.width) ? (screen.width-w)/3 : 0;
 TopPos = (screen.height) ? (screen.height-h)/3 : 0;
 settings='height='+h+',width='+w+',top='+TopPos+',left='+LeftPos+',scrollbars=1,resizable=1';
 okno = window.open(destination,name,settings);

}
function resizeWindow(elementID) {
	if (document.getElementById(elementID)) {
		width=document.getElementById(elementID).width;
		height=document.getElementById(elementID).height;
		window.resizeTo(width+30, height+60);
	}
}