if (document.images) {
  //menu
  var homeOFF = new Image(); homeOFF.src="images/buttons/home.gif";
  var homeON = new Image(); homeON.src="images/buttons/homeroll.gif";
  var profileOFF = new Image(); profileOFF.src="images/buttons/profile.gif";
  var profileON = new Image(); profileON.src="images/buttons/profileroll.gif";

  var practiceOFF = new Image(); practiceOFF.src="images/buttons/practice.gif";
  var practiceON = new Image(); practiceON.src="images/buttons/practiceroll.gif";
  var costOFF = new Image(); costOFF.src="images/buttons/cost.gif";
  var costON = new Image(); costON.src="images/buttons/costroll.gif";

  var locOFF = new Image(); locOFF.src="images/buttons/location.gif";
  var locON = new Image(); locON.src="images/buttons/locationroll.gif";
  var linkOFF = new Image(); linkOFF.src="images/buttons/links.gif";
  var linkON = new Image(); linkON.src="images/buttons/linksroll.gif";
 
  var sub41OFF = new Image(); sub41OFF.src="images/buttons/estate.gif";
  var sub41ON = new Image(); sub41ON.src="images/buttons/estateroll.gif";
  var sub42OFF = new Image(); sub42OFF.src="images/buttons/other.gif";
  var sub42ON = new Image(); sub42ON.src="images/buttons/otherroll.gif"; 
}


function act(imgName) {
 if (document.images) 
  document[imgName].src = eval(imgName + 'ON.src')
}

function inact(imgName) {
 if (document.images)
  document[imgName].src = eval(imgName + 'OFF.src')
}