var viewportwidth;
var viewportheight;
var CurrentBlock = "index";
function ViewPort() {
	if (typeof window.innerWidth != 'undefined')
	{
	  viewportwidth = window.innerWidth,
	  viewportheight = window.innerHeight
	}
	else if (typeof document.documentElement != 'undefined'
	&& typeof document.documentElement.clientWidth !=
	'undefined' && document.documentElement.clientWidth != 0)
	{
	   viewportwidth = document.documentElement.clientWidth,
	   viewportheight = document.documentElement.clientHeight
	}
	else
	{
	   viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
	   viewportheight = document.getElementsByTagName('body')[0].clientHeight
	}
}
function init() {
	ViewPort();
	viewportheight = viewportheight - 334;
	document.getElementById("Content").style.minHeight = viewportheight + "px";
}
function MainMenu(bObjId,aObjId) {
	document.getElementById(CurrentBlock).style.display = 'none';
	CurrentBlock = bObjId;
	document.getElementById("ArtBg").className = 'Center ' + aObjId;
	document.getElementById(bObjId).style.display = 'block';	
}