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

sizes = getSize ( );
if ( sizes[1] > 700 ) {
	document.getElementById ( "wrapper" ).style.marginTop = ( ( sizes[1] - 700) / 2 ) + "px";
}