// PRE-LOAD IMAGES AND SET UP SWAPPING //

if (document.images)  {

// ON IMAGES //
homeON = new Image(30,139);
homeON.src = "img/nav_home_on.gif";
propertiesON = new Image(30,93);
propertiesON.src = "img/nav_properties_on.gif";
luxuryrentalsON = new Image(30,123);
luxuryrentalsON.src = "img/nav_luxuryrentals_on.gif";
aboutusON = new Image(30,80);
aboutusON.src = "img/nav_aboutus_on.gif";
contactusON = new Image(30,160);
contactusON.src = "img/nav_contactus_on.gif";

// OFF IMAGES //
homeOFF = new Image(30,139);
homeOFF.src = "img/nav_home_off.gif";
propertiesOFF = new Image(30,93);
propertiesOFF.src = "img/nav_properties_off.gif";
luxuryrentalsOFF = new Image(30,123);
luxuryrentalsOFF.src = "img/nav_luxuryrentals_off.gif";
aboutusOFF = new Image(30,80);
aboutusOFF.src = "img/nav_aboutus_off.gif";
contactusOFF = new Image(30,160);
contactusOFF.src = "img/nav_contactus_off.gif";
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}