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browser_name = navigator.appName; 
browser_version = parseFloat(navigator.appVersion); 
if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; } 
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; } 
else { roll = 'false'; } 
function over(img,ref) { if (roll == 'true') { document.images[img].src = ref; } } 
function out(img,ref) { if (roll == 'true') { document.images[img].src = ref; } } 
if (roll == 'true') 
{ 
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} 
//-->