function swap(obj,suffix,ext) {
	if (ext==null || ext=="") {
		ext=".jpg";
	}
	obj.src='images/' + obj.id + suffix + ext;
}

var currObj=1;
function bringToFront(obj) {
	if (currObj>1) {
		document.getElementById('tab_'+currObj).style.top=(75 * (currObj-1))+"px";
	} else {
		document.getElementById('tab_'+currObj).style.top=(75 * currObj)+"px";
	}
	document.getElementById('tab_'+currObj).style.zIndex=(1000 - currObj);
	document.getElementById('tab_'+obj).style.top='0px';
	document.getElementById('tab_'+obj).style.zIndex+=currObj;
	currObj=obj;
}