prvpst_rollOvers = {};
prvpst_rollOuts = {};

function initRollOvers() {
	if(document.images && document.getElementsByTagName && document.childNodes && document.createElement) {
		var navs = document.getElementsByTagName("a");
		for(var i = 0; i < navs.length; i++) {					
			var nav = navs[i];			
			if(nav.className == "rollOverItem") {				
				_prvpst_iri(nav);
			}			
		}	
	}
}

function _prvpst_iri(e) {	
	var img = e.getElementsByTagName("img")[0];
	
	prvpst_rollOvers[img.id] = new Image();
	prvpst_rollOvers[img.id].src = img.src.replace('.png', 'RL.png');	

	prvpst_rollOuts[img.id] = new Image();
	prvpst_rollOuts[img.id].src = img.src;	
	
	e.onmouseover = prvpst_nav_rollover;
	e.onmouseout = prvpst_nav_rollout;
}

function prvpst_nav_rollover() {
	var t = this.getElementsByTagName("img")[0];
	t.src = prvpst_rollOvers[t.id].src;
}

function prvpst_nav_rollout() {
	var t = this.getElementsByTagName("img")[0];
	t.src = prvpst_rollOuts[t.id].src;
}