var OS,browser,version;

function browserCheck()
{
    var thestring;

    function checkIt(string)
    {
	    place = detect.indexOf(string) + 1;
	    thestring = string;
	    return place;
    }
    
    var detect = navigator.userAgent.toLowerCase();
    
    if (checkIt('konqueror'))
    {
	    browser = "Konqueror";
	    OS = "Linux";
    }
    else if (checkIt('safari')) browser = "Safari"
    else if (checkIt('omniweb')) browser = "OmniWeb"
    else if (checkIt('opera')) browser = "Opera"
    else if (checkIt('webtv')) browser = "WebTV";
    else if (checkIt('icab')) browser = "iCab"
    else if (checkIt('msie')) browser = "Internet Explorer"
    else if (!checkIt('compatible'))
    {
	    browser = "Netscape Navigator"
	    version = detect.charAt(8);
    }
    else browser = "An unknown browser";

    if (!version) version = detect.charAt(place + thestring.length);

    if (!OS)
    {
	    if (checkIt('linux')) OS = "Linux";
	    else if (checkIt('x11')) OS = "Unix";
	    else if (checkIt('mac')) OS = "Mac"
	    else if (checkIt('win')) OS = "Windows"
	    else OS = "an unknown operating system";
    }
}

browserCheck();

var fMozilla = (browser == "Netscape Navigator");

function setOpacity(el, percent)
{
    if (fMozilla)
        el.style.MozOpacity = percent / 100;
    else
	    el.style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=" + percent + ")";
}