//以下代码为导航栏下拉菜单的代码
        var t=false,current;
        function SetupMenu(){                                           //设置菜单 
            if(!document.getElementsByTagName)return;
            var items=document.getElementsByTagName("li");
            for (i=0; i<items.length;i++){
                if (items[i].className =="top_menu_li"){
                    var thelink=findChild(items[i],"A");
                    thelink.onmouseover=ShowMenu;
                    thelink.onmouseout=StartTimer;                    
                }

                if(ul=findChild(items[i],"UL")){
                    ul.style.display="none";
                    ul.onmouseover=ResetTimer;
                    ul.onmouseout=StartTimer;
                 }
             }
        }

        function findChild(obj, tag) {
            if (obj != null) {
                var cn = obj.childNodes;
                for (var k = 0; k < cn.length; k++) {
                    if (cn[k].nodeName == tag) return cn[k];
                }
                return false;
            }
            return false;
            
        }
        
        function ShowMenu(e){
            if(!e) var e=window.event;
            
            var thislink=(e.target)? e.target: e.srcElement;
            ResetTimer();
            
            if (current) HideMenu(current);
            thislink=thislink.parentNode;
            current=thislink;
            
            ul=findChild(thislink,"UL");
            if(!ul) return;
            ul.style.display="block";
       }
       
       function HideMenu(thelink){
            ul=findChild(thelink,"UL");
            if(!ul) return;
            ul.style.display="none";
       }
       
       function ResetTimer(){
            if(t) window.clearTimeout (t);
       }
       
       function StartTimer(){
            t=window.setTimeout("HideMenu(current)",400);
       }

  window.setTimeout(SetupMenu,50);  
//工程实拍图片滚动
  function srollPicLeft(){
        var speed=60;
        var scrollDistence=150;
        var marquee_demo=document.getElementById("marquee_demo");
        var marquee_product2=document.getElementById("marquee_product2");
        var marquee_product1=document.getElementById("marquee_product1");
        marquee_product2.innerHTML=marquee_product1.innerHTML;
        function Marquee(){ 
            if(marquee_demo.scrollLeft>=marquee_product1.scrollWidth){ 
                marquee_demo.scrollLeft=0;
            }
            else{ 
                marquee_demo.scrollLeft++;
            }
        } 
        var MyMar=setInterval(Marquee,speed);
        marquee_demo.onmouseover=function(){clearInterval(MyMar);} 
        marquee_demo.onmouseout=function(){MyMar=setInterval(Marquee,speed);} 
  }


//以下代码为行业动态和技术支持列表滚动
    function ScrollListUp(main,div1,div2){
        var speed=60;
        var containMain=document.getElementById(main);
        var containDiv1=document.getElementById(div1);
        var containDiv2=document.getElementById(div2);
        containDiv2.innerHTML=containDiv1.innerHTML;
        function Marquee(){ 
            if(containMain.scrollTop>=containDiv1.offsetHeight){ 
                containMain.scrollTop=0;
            }
            else{ 
                containMain.scrollTop++;
            }
        }
        var MyMar=setInterval(Marquee,speed);
        containMain.onmouseover=function(){clearInterval(MyMar);} 
        containMain.onmouseout=function(){MyMar=setInterval(Marquee,speed);} 
    }