function show_shadow()
	{
		var a = document.getElementsByTagName("html")[0].scrollHeight;
		var b = document.getElementsByTagName("html")[0].offsetHeight;
		if (a>b) { var k = a; } else { var k = b; };
		if (k<screen.height) {k=screen.height;};
		a = document.getElementsByTagName("html")[0].scrollWidth;
		b = document.getElementsByTagName("html")[0].offsetWidth;
		if (a>b) { var kw = a; } else { var kw = b; };
		if (kw<screen.width) {kw=screen.width-22;};
		document.getElementById("black_shadow").style.height = k+'px';
		document.getElementById("black_shadow").style.width = kw+'px';
		document.getElementById("black_shadow").style.left = '0';
		document.getElementById("black_shadow").style.display = 'block';

	document.getElementById("expose").style.display = 'block';
	
	document.getElementById("close_expose_window").style.display = 'block';

	}
	
	
			

			
	function expose_position(e) {
		//Browser Modus überprüfen
		var docEl = (
				typeof document.compatMode != "undefined" && 
				document.compatMode        != "BackCompat"
				)? "documentElement" : "body";
			
		//Scrollhöhe für IE dazu ermitteln
		if (document.all && !document.captureEvents) {
				var absolut_maus= window.event.y;
				var relative_maus = window.event.clientY;
				absolut_maus    += document[docEl].scrollTop;
		} 
		else{
			//Absolute Position des Mauszeigers für restliche Browser
			var absolut_maus    = 	e.pageY;
			var relative_maus	=	e.clientY;
		}
			
		var relative_expose = document.documentElement.clientHeight;
		if (relative_expose==0){
			relative_expose = document.documentElement.offsetHeight;
		}
		else if (relative_expose<=0 || relative_expose!=''){
			relative_expose = 1600;
		}
		relative_expose = (relative_expose - 595)/2;
		
		var yPos= absolut_maus  - relative_maus + 150 ;
		document.getElementById("expose").style.top = ( yPos)  +'px';
		document.getElementById("close_expose_window").style.top = ( yPos-20)  +'px';
			
	}
	
	document.onmousedown= expose_position;
	
	
	
	function hide_shadow()
	{
   	document.getElementById("black_shadow").style.left = '-3000';
	document.getElementById("black_shadow").style.display = 'none';
	document.getElementById("expose").style.display = 'none';
	document.getElementById("close_expose_window").style.display = 'none';

	}