function facebook() {
	url = 'http://www.facebook.com/sharer.php?u=' + encodeURIComponent(document.location);
	
	var posX, posY; //position of popup
	var w=625, h=425; //size of popup
	var offsetX=30, offsetY=30; //x and y offset relative to the parent window
	if (typeof window.screenLeft != "undefined"){ //IE
	posX = window.screenLeft + offsetX;
	posY = window.screenTop + offsetY; 
	}
	else if (typeof window.screenX != "undefined"){ //NS/Moz
	posX = window.screenX + offsetX;
	posY = window.screenY + offsetY;
	}
	else { //default - center of screen
	posX = screen.availWidth/2 - w/2;
	posY = screen.availHeight/2 - h/2;
	}
	var win = window.open(url,"_blank","width="+w+",height="+h+",left="+posX+",top="+posY);
	win.focus();
}