function openPopUp(url) {
	window.open(url, "win", "resizable=yes,scrollbars=yes");
}

function openPopUp(url,width,height) {
	// calculate the center of the page
	x = (screen.availWidth - width) / 2;
	y = (screen.availHeight - height) / 2;

	popupwin = window.open(url, "win","resizable=yes,scrollbars=yes,width="+width+",height="+height+",left="+x+",top="+y+"");
}

function changeStyleClass(elemId, styleClassName) {
	var elem;
	if(document.getElementById) {
		var elem = document.getElementById(elemId);
	} else if (document.all){
		var elem = document.all[elemId];
	}
	elem.className = styleClassName;
}