var currLayerId = "quality"; 

function togLayer(id) 
{ 
if(currLayerId) setDisplay(currLayerId, "none"); 
if(id)setDisplay(id, "block"); 
currLayerId = id; 
} 

function setDisplay(id,value) 
{ 
var elm = document.getElementById(id); 
elm.style.display = value; 
}

function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}