function menuIcon(id)   
{  
var allElements = document.getElementById(id).getElementsByTagName("li");    
for (var i=0; i < allElements.length; i++)   
{   
allElements[i].onmouseover = mouseGoesOver;   
allElements[i].onmouseout = mouseGoesOut;   
}   
}   
function mouseGoesOver()   
{   
originalClassNameString = this.className;   
this.className += "On";   
}   
function mouseGoesOut()   
{   
this.className = originalClassNameString;   
}