//--------------------------鼠标滑入-----------------------------//
function mouseover(num){
var mainMenuName= 'Main'+num;
var subLayerName= 'index' +num; 
var mainMenu=eval("document.all."+mainMenuName);
var subLayer=eval(subLayerName);

var e=[0,0];
var el=mainMenu;
while(el)
{e[0]=e[0]+el.offsetLeft;
e[1]=e[1]+el.offsetTop;
el=el.offsetParent;}


//subLayer.style.left=mainMenu.offsetLeft+mainDiv.offsetLeft;
//subLayer.style.top=mainMenu.offsetTop+mainMenu.offsetHeight+mainDiv.offsetTop+mainDiv.offsetHeight;// subLayerTop
subLayer.style.top="145px";// subLayerTop
subLayer.style.left=e[0];
subLayer.style.top=e[1]+mainMenu.offsetHeight;

subLayer.style.visibility="visible";

}
//--------------------------鼠标滑出-----------------------------//
function mouseout(num){
var mainMenuName= 'Main'+num;
var subLayerName= 'index' +num; 
var mainMenu=eval("document.all."+mainMenuName);
var subLayer=eval(subLayerName);

subLayer.style.visibility='hidden';

}