window.onload = initialise;



function initialise()
{

menuitems = document.getElementById("mainmenu").getElementsByTagName("li");

for(i=0; i<menuitems.length; i++)
{
menuitems[i].onmouseover = function(){show(this.getElementsByTagName("ul")[0]);}
menuitems[i].onmouseout = function(){hide(this.getElementsByTagName("ul")[0]);}

}

}




function show(element)
{
if(element != null)
{
element.style.display = "block";
}
}

function hide(element)
{
if(element != null)
{
element.style.display = "none";
}
}