function changeImages(name1, name2) {
	var src1 = document.images[name1].src;
	var src2 = document.images[name2].src;
	src2 = src2.replace("thumb_","");
	document.images[name1].src = src2;
}

function popup(w,h,t,l,url,winName,status,toolBar,scrollBars,resizable) {
	if (scrollBars == undefined) scrollBars = "auto";
	if (resizable == undefined) resizable = "no";
  	var sWid = screen.width;
  	var sHi = screen.height;
	var wid = w;
	var hi = h;
	if ((t == 0) && (l == 0)) {
		var tp = (sHi/2)-(hi/2);
		var lft = (sWid/2)-(wid/2);
	} else {
		var tp = t;
		var lft = l;	
	}
	if (scroll && document.all && (navigator.userAgent.indexOf("Mac") > -1)) wid = wid+17;
	newwin=window.open(url,winName,"width=" + wid + ",height=" + hi + ",status=" + status + ",scrollbars=" + scrollBars + ",toolbar=" + toolBar + ",resizable=" + resizable + ", top = "+ tp +", left ="+ lft + ", screenX=" + lft +", screenY= "+tp);
	newwin.focus();
}

function changeClassName(name, className){
	var obj = document.getElementById(name);
	obj.className = className;
}


function writeLayer(name, txt){
	var layer = document.getElementById(name);
	layer.innerHTML = txt;
}

function displayLayer(name, visible){
	var foc = document.getElementById(name);
	if (foc) {
		if (visible) {
			foc.style.display='block';
		} else {
			foc.style.display='none';
		}
	}
}

function setStyle(name, property, value){
	var foc = document.getElementById(name);
	if (foc) {
		foc.style[property] = value;
	}
}