window.onload = Doload;
function Doload()
{
var imgs = new Array( "logo_color250.gif",
                      "logo_color253.gif");
                      
var preload = new Array()

for (var i = 1; i < imgs.length; i++ )
{

       preload[i] = new Image();
       preload[i].src = imgs[i];
}
return;
}

function RollButton(ButtonID)
{
switch(ButtonID)
{
case 'LogoOn'   : document.images.Logo.src = "logo_color250.gif"; break;
case 'LogoOff'  : document.images.Logo.src = "logo_color253.gif"; break;

default : alert("Script Error - ButtonID=" + ButtonID);
return;
}
}