// 菜单类

function menuControl(show) 
{ 
    window.event.cancelBubble=true; 
    var objID=event.srcElement.id; 
    var index=objID.indexOf("_"); 
    var mainID=objID.substring(0,index); 
    var numID=objID.substring(index+1,objID.length); 
    if(mainID=="menubar") 
    { 
       if(show==1) 
       { 
          eval("showMenu("+"menu_"+numID+")"); 
       } 
       else 
       {
          eval("hideMenu("+"menu_"+numID+")"); 
       } 
    } 
} 

var nbottom=0,speed=5; 
function displayMenu(obj) 
{     
    obj.style.clip="rect(0 100% "+nbottom+"% 0)"; 
    nbottom+=speed; 
    if(nbottom<=100)
    { 
        timerID=setTimeout("displayMenu("+obj.id+"),70"); 
    } 
    else 
        clearTimeout(timerID); 
} 
function showMenu(obj) 
{ 
    obj.style.display="block"; 
    obj.style.clip="rect(0 0 0 0)"; 
    nbottom=5; 
    displayMenu(obj); 
} 
function hideMenu(obj) 
{ 
    nbottom=0; 
    obj.style.display="none"; 
} 
function keepMenu(obj) 
{ 
    obj.style.display="block"; 
}