// javascript document

window.onload=function(){
	
	var oli=getbyclass(document,'lt');
	var odown=getbyclass(document,'bg');
	var timer=null;


	for(var i=0;i<oli.length;i++){
		
        oli[i].index=i;
        oli[i].onmouseover=function (){
            for(var i=0;i<odown.length;i++){
                odown[i].style.display='none';
            }   
           odown[this.index].style.display='block';
           cleartimeout(timer);
        };
        oli[i].onmouseout=function (){
           var this=this;
           timer=settimeout(function(){
               odown[this.index].style.display='none';
           },1000); 
       };
        odown[i].onmouseover=function (){
           cleartimeout(timer);
        };
        odown[i].onmouseout=function (){
          	timer=settimeout(function(){
            	this.style.display='none';
          	},1000);
    	};
	}
	
	function getbyclass(oparent,sclass){
			var aele=oparent.getelementsbytagname("*");
			var result=[];
			var re=new regexp('\\b' + sclass + '\\b','i');
			for ( var i=0;i<aele.length;i++){
				if(re.test(aele[i].classname)){
				 result.push(aele[i]);
				} 
			 }
		 return result;
	}
};