function getIEVersion()
{

	var intPos = navigator.appVersion.indexOf("MSIE");
	
	if (intPos == -1)
	{
		return -1;
	}
	else
	{
		var strVersion = navigator.appVersion.substring(intPos+4);
		return parseFloat(strVersion);
	}
}



function isIE()
{
	var intPos = navigator.appVersion.indexOf("MSIE");
	if (intPos == -1)
		return false;
	else
		return true;


}


function isWindows()
{
	var intPos = navigator.appVersion.indexOf("Windows");
	if (intPos == -1)
		return false;
	else
		return true;

}

function isMac()
{
	var intPos = navigator.appVersion.indexOf("Macintosh");
	if (intPos == -1)
		return false;
	else
		return true;

}