//顶部导航
function ontop(selfObj){
	var ul=document.getElementById("top_navigation").getElementsByTagName("li");
	var ullength = ul.length;
	for(i=0; i<ullength; i++){
		ul[i].className = "";
	}
	    selfObj.parentNode.className = "selected";
}

function outtop(selfObj){
	var ul=document.getElementById("top_navigation").getElementsByTagName("li");
	var ullength = ul.length;
	for(i=0; i<ullength; i++){
		ul[i].className = "";
	}
	    selfObj.parentNode.className = " ";
}

/** 二级菜单*/
function menuFix() {
 var sfEls = document.getElementById("top_navigation").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"), "");
  }
 }
}
window.onload=menuFix;

/** 解决IE6下HOVER的问题*/
stuHover = function() {
var cssRule;
var newSelector;
for (var i = 0; i < document.styleSheets.length; i++)
 for (var x = 0; x < document.styleSheets[i].rules.length ; x++)
 {
 cssRule = document.styleSheets[i].rules[x];
 if (cssRule.selectorText.indexOf("LI:hover") != -1)
 {
 newSelector = cssRule.selectorText.replace(/LI:hover/gi, "LI.iehover");
 document.styleSheets[i].addRule(newSelector , cssRule.style.cssText);
 }
 }
var getElm = document.getElementById("top_navigation").getElementsByTagName("LI");
for (var i=0; i<getElm.length; i++) {
 getElm[i].onmouseover=function() {
 this.className+=" iehover";
 }
 getElm[i].onmouseout=function() {
 this.className=this.className.replace(new RegExp(" iehover\\b"), "");
 }
}
}
if (window.attachEvent) window.attachEvent("onload", stuHover);