function getWindowHeightAndWidth() {
	var myHeight = 0;
	var myWidth = 0;
	if( typeof( window.innerHeight ) == 'number' ) {
		//Non-IE
		myHeight = window.innerHeight;
		myWidth = window.innerWidth;
	} else if( document.documentElement && document.documentElement.clientHeight ) {
		//IE 6+ in 'standards compliant mode'
		myHeight = document.documentElement.clientHeight;
		myWidth = document.documentElement.clientWidth;
	} else if( document.body && document.body.clientHeight ) {
		//IE 4 compatible
		myHeight = document.body.clientHeight;
		myWidth = document.body.clientWidth;
	}
	var height=myHeight;
	var width=myWidth;

	// hoogte td_links, td_midden en td_rechts
	 var top;
  
	  if (myHeight<615)
	  {
		top = 0;
	  } else {
		top = Math.round((myHeight-615)/2);
	  }

	  var left;

	  if (myWidth<1002)
	  {
		  left = 0;
	  } else {
		  left = Math.round((myWidth-1002)/2);
	  }

	  document.getElementById('outerwrap').style.top=top.toString()+'px';
	  document.getElementById('outerwrap').style.left=left.toString()+'px';
	  document.getElementById('outerwrap').style.visibility='visible';
}