function menuFix(nav) {
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 sea(){
	if(document.getElementById("chec1").checked) {
		window.open("http://www.youdao.com/search?q=site:tx2.163.com "+ document.getElementById("word").value)
	}
	else if(document.getElementById("chec2").checked){
		window.open("http://www.youdao.com/search?q=site:tx2.163.com/news/ "+ document.getElementById("word").value)
	}
	else if(document.getElementById("chec3").checked){
		window.open("http://www.youdao.com/search?q=site:tx2.163.com/skill/ "+ document.getElementById("word").value)
	}
	else if(document.getElementById("chec4").checked){
		words = encodeURI(document.getElementById("word").value)
		window.open("http://tx2.zhidao.163.com/htdocs/search/search.html#q= "+ words)
	}
}