function ChangeImg() {
 if(document.images) {
  eval("document."+ChangeImg.arguments[0]+
  ".src=('"+ChangeImg.arguments[1]+"')");
 }
}

function showmenu(elmnt)
{
document.getElementById(elmnt).style.visibility="visible"
}
function hidemenu(elmnt)
{
document.getElementById(elmnt).style.visibility="hidden"
}