var tt;
var isIE6 = /msie|MSIE 6/.test(navigator.userAgent);

function tooltip_show(element_name) {
	clearTimeout(tt);
	document.getElementById(element_name).style.display='block'; 
}

function tooltip_mouseout(element_name) {
 	tt = setTimeout("if (document.getElementById(\'" + element_name + "\').style.display==\'block\') {document.getElementById(\'" + element_name + "\').style.display=\'none\';}", 5000);
}