var Ptr;
function $_huanse(tab_count) {
	for(var k=1;k<=tab_count;k++){
	
		Ptr=document.getElementById("tab"+k).getElementsByTagName("li");
		for (var i=1;i<Ptr.length+1;i++) {
			Ptr[i-1].className = (i%2>0)?"t1":"t2";
      	}
		for(var i=0;i<Ptr.length;i++) {
			Ptr[i].onmouseover=function(){
				  this.tmpClass=this.className;
				  this.className = "t3";
			  };
			  Ptr[i].onmouseout=function(){
				 this.className=this.tmpClass;
		  };
		}
	}
	
}