medstat.prepareTopnav = function ()
{
		var topnav = medstat.getObject( "navigationTopMenu" );
		var urlBase = "/templates/main/images/menus/topnav/";
		var srcParts, imageFile, imageName, imageExt;

		if ( ! topnav ) {
			return;
		}

		var items = topnav.getElementsByTagName( "img" );
		if ( ! items ) {
			return;
		}

		var i;
		for ( i = 0; i < items.length; i++ ) {
			srcParts  = items[i].src.split("/");
			imageFile = srcParts[srcParts.length-1];
			srcParts  = imageFile.split(".");
			imageName = srcParts[0];
			imageExt  = srcParts[1];

			items[i].onmouseover = new Function("this.src = '" + urlBase + items[i].id + "_OVER." + imageExt + "';");
			items[i].onmouseout  = new Function("this.src = '" + urlBase + items[i].id + "." + imageExt + "';");
		}
}


medstat.addPageloadScript( medstat.prepareTopnav );