function showBlackBg(){
	var bg = document.getElementById("blackBg");
	this.ver=navigator.appVersion;
	this.agent=navigator.userAgent;
	this.dom=document.getElementById?1:0;
	this.opera5=this.agent.indexOf("Opera 5")>-1;
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
	this.ie55=(this.ver.indexOf("MSIE 5.5")>-1 && this.dom && !this.opera5)?1:0; 
	this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
	this.ie7=(this.ver.indexOf("MSIE 7")>-1 && this.dom && !this.opera5)?1:0;
	if(bg){
		bg.style.display = "block";
		bg.style.width = getDocumentWidth() + "px";
		if(this.ie7){
			bg.style.height = getElementPosition("footerBlock").top + 30 + "px";
		}
		else{
			bg.style.height = getDocumentHeight() + 20 + "px";
		}
	}
}
function hideBlackBg(){
	var bg = document.getElementById("blackBg");
	if(bg){
		bg.style.display = "none";
	}
}
function addHash(name){
	location.hash = name;	
}
function getDocumentHeight(){
	return (document.body.scrollHeight > document.body.offsetHeight)?document.body.scrollHeight:document.body.offsetHeight;
}
function getDocumentWidth(){
	return (document.body.scrollWidth > document.body.offsetWidth)?document.body.scrollWidth:document.body.offsetWidth;
}
function getClientWidth(){
  return document.compatMode=='CSS1Compat' && !window.opera?document.documentElement.clientWidth:document.body.clientWidth;
}
function getClientHeight(){
  return document.compatMode=='CSS1Compat' && !window.opera?document.documentElement.clientHeight:document.body.clientHeight;
}
function getElementPosition(elemId){
    var elem = document.getElementById(elemId);
	
    var w = elem.offsetWidth;
    var h = elem.offsetHeight;
	
    var l = 0;
    var t = 0;
	
    while (elem)
    {
        l += elem.offsetLeft;
        t += elem.offsetTop;
        elem = elem.offsetParent;
    }

    return {"left":l, "top":t, "width": w, "height":h};
}