var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

var xPos = 0;
var yPos = 0;

function getScroll()
{
    if (window.pageYOffset)
    {
        yPos = window.pageYOffset;
    } 
    else if (document.documentElement && document.documentElement.scrollTop)
    {
        yPos = document.documentElement.scrollTop; 
    }   
    else if (document.body) 
    {
        yPos = document.body.scrollTop;
    }
    //alert(yPos);
}

	function setScroll(x, y){
		window.scrollTo(x, y); 
	}
	
	function activate(){
		if (browser == 'Internet Explorer'){
			getScroll();
			prepareIE('100%', 'hidden');
			//setScroll(0,0);
			//this.hideSelects('hidden');
		}
		//this.displayLightbox("block");
	}
	function prepareIE(height, overflow){
		bod = document.getElementsByTagName('body')[0];
		bod.style.height = height;
		bod.style.overflow = overflow;
  
		htm = document.getElementsByTagName('html')[0];
		htm.style.height = height;
		htm.style.overflow = overflow; 
	}
	
	function deactivate(){
		//Element.remove($('lbContent'));
		
		if (browser == "Internet Explorer"){
			setScroll(0,yPos);
			prepareIE("auto", "auto");
			//this.hideSelects("visible");
		}
		
		//this.displayLightbox("none");
	}
	
	getBrowserInfo();
	
	
	
	
function getBrowserInfo() {
	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";
	}
}

function checkIt(string) {
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}