// JavaScript Document

function center() {
			var myMaxH = (document.documentElement.clientHeight);
			var containerH = (document.getElementById('container').style.height);
			
			var position = containerH.length - 2;			
			var myCurrentH = containerH.substring(0,position);
			
			var tmargin = myMaxH - myCurrentH;
						
			if (tmargin > 0)
		       	{
					document.getElementById('container').style.margin = (tmargin/2) + "px auto";
				}
		    else
				{
		        	document.getElementById('container').style.margin = "0 auto";
					document.getElementById('container').style.top = "-100px";
					document.body.style.backgroundImage = "url('../pix/fondGd900.jpg')";
		    		document.getElementById('container').style.display="block";
				}
	   }