function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 //****Edit this list to include rollover state images ****
 //****Example: aboutus_over = newImage( "images/aboutus-over.gif" );
 buttonhome_over = newImage("navpics/homeover.gif");
 buttonprop_over = newImage("navpics/propover.gif");
 buttoncont_over = newImage("navpics/contactover.gif");
 buttonlink_over = newImage("navpics/linksover.gif");
 preloadFlag = true;
 }
}