// return the rv value of a Gecko user agent
// as a floating point number. 
// returns -1 for non-gecko browsers, 
//          0 for pre Netscape 6.1/Gecko 0.9.1 browsers
//          number > 0 where each portion of 
//          the rv value delimited by . 
//          will be treated as value out of 100.
//          e.g. for rv: 3.12.42, 
//          getGeckoRv() returns 3.1242
//          
function geckoGetRv()
{
	if (navigator.product != 'Gecko')
	{
		return -1;
	}
	var rvValue = 0;
	var ua      = navigator.userAgent.toLowerCase();
	var rvStart = ua.indexOf('rv:');
	var rvEnd   = ua.indexOf(')', rvStart);
	var rv      = ua.substring(rvStart+3, rvEnd);
	var rvParts = rv.split('.');
	var exp     = 1;

	for (var i = 0; i < rvParts.length; i++)
	{
		var val = parseInt(rvParts[i]);
		rvValue += val / exp;
		exp *= 100;
	}

	return rvValue;
}

function preloadImages(pics)
{
	for(var i=0; i<pics.length; i++)
	{
		var image = new Image();
		image.src = pics[i];
	}
}