function zx_search() {
if( document.zxform.keyword.value == "" ) {
	alert("\ÇëÊäÈë¹Ø¼ü´Ê£¡")
	document.zxform.keyword.focus()
	return false;
}
}  
function menuFix() { 
var sfEls = document.getElementById("nav").getElementsByTagName("td"); 
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"), 
 
""); 
} 
} 
} 
window.onload=menuFix;