browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 
 
if (browser_name == "Netscape" && browser_version < 2.0)
   {roll = 'false';}
else if (browser_name == "Netscape" && browser_version == 2.0)
   {roll = 'false';}
else if (browser_name == "Netscape" && browser_version >= 3.0)
   {roll = 'true';}
else if (browser_name == "Microsoft Internet Explorer" && browser_version <= 2.0)
   {roll = 'false';}
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0)
   {roll = 'true';}
else if (browser_version >= 4.0) 
   {roll = 'true';}
else
   {roll = 'false';}
 
function toggle(img,ref)
   {if (roll == 'true')
       {
			var ref = document.images[img].src;
			if (ref.indexOf('0.gif')==-1) {ref = findandreplace(ref,'1.gif','0.gif');}
			else {ref = findandreplace(ref,'0.gif','1.gif');}
			document.images[img].src = ref;
	   }
   }
 
function findandreplace(source, searchstring, replacement)
{   
    if ((source == null) || (searchstring == null))           { return null; }
    if ((source.length == 0) || (searchstring.length == 0))   { return source; }
    if ((replacement == null) || (replacement.length == 0))    { replacement = ""; }
    var pos = source.indexOf(searchstring, 0);
    while (pos >= 0)
    {
         source = source.substring(0, pos) + replacement + source.substring(pos + searchstring.length);
         pos = source.indexOf(searchstring, pos + replacement.length);
    }
    return source;
}

//end