function top_tabs() {
	$$("#top_nav img").each(function(item) { 

		if(item.getAttribute('id') != 'top_active') {
			item.onmouseover = function () {
				var id = this.getAttribute('id'); 			
				nr = id.replace(/^(.*):(.*)$/, "$2");
				this.src = "files/pix/top_tabs/" + (nr-12) + "_2.gif";
			}
			item.onmouseout = function () {
				var id = this.getAttribute('id'); 			
				nr = id.replace(/^(.*):(.*)$/, "$2");
				this.src = "files/pix/top_tabs/" + (nr-12) + ".gif";
			}
			item.onclick = function () {
				var id = this.getAttribute('id'); 			
				href = id.replace(/^(.*):(.*)$/, "$1");
				window.location.href= href + ".htm";
			}
		}
	}); 
	
	var ar = new Array();
	for (var i=1; i<=5; i++) {
        ar[i] = new Image();
        ar[i].src = "files/pix/top_tabs/" + i + ".gif";
    }
    
}