function init() 
　　{
　　makeflash(bob);
　　}
　　function makeflash(obj)
　　{
　　obj.flashTimer=setInterval("bob.filters.glow.enabled= !bob.filters.glow.enabled",1000)
　　} 
　　function stopflash(obj) 
　　{ clearInterval(obj.flashTimer)
　　}

function topmenu1(num)
{  var num,menu1,menu2;
 	menu1 = document.all.dicatop1.style;
	menu2 = document.all.dicatop2.style;
	if( num == 1 )
	{		menu1.display = 'block';
			menu2.display = 'none';
	}
	else if( num == 2 )
	{		menu1.display = 'none';
			menu2.display = 'block';
	}
}

function showOlytime()
{	var xmlhttp = false; 
	try	{ 
		    xmlhttp = new ActiveXObject("MSXML2.XMLHTTP"); 
		} 
		catch(e) 
		{ 	    try 
		    { 
		        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
		    } 
		    catch(e2){xmlhttp = false;} 
		} 
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		try {		xmlhttp = new XMLHttpRequest();
		} catch (e) {
			xmlhttp=false;
		}
	}
	if (!xmlhttp && window.createRequest) {
		try {
			xmlhttp = window.createRequest();
		} catch (e) {
			xmlhttp=false;
		}
	}
	var now;
	try{
		xmlhttp.open("GET", "http://www.bit.edu.cn/", false);
		xmlhttp.setRequestHeader("If-Modified-Since","q"); 
		xmlhttp.send(null); 
		
		var dateStr=xmlhttp.getResponseHeader("Date"); 
		now=new Date(dateStr); 
		if(isNaN(now))
			now = new Date(); 
	}catch (e) {
		now = new Date(); 
	}
	var oly = new Date(2008,7,8,20,8,0,0);
	var dis = oly-now;
	var days = Math.floor( dis/(1000*60*60*24));
	document.write("距北京奥运会开幕还有<font color=red>"+days+"</font>天");
}

function menuFix() {
    var sfEls = document.getElementById("nav").getElementsByTagName("li");
    for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmouseover=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onMouseDown=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onMouseUp=function() {
        this.className+=(this.className.length>0? " ": "") + "sfhover";
        }
        sfEls[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp("( ?|^)sfhover\\b"),
"");
        }
    }

}
function showchildmenu()
	{
		//alert(obj.value());
		 var obj = document.getElementById("childleft");
		 //child.innertext="hello";
		 obj.style.display="block";
	}
function hiddenmenu()
{
	    var obj = document.getElementById("childleft");

		 obj.style.display="none";
}