function resize() {
	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;
	}
	if(myHeight < 800) {
		topM = (myHeight / 2) * -1 + "px";
		//alert(topM);
		document.getElementById("background").style.marginTop = topM;
		document.getElementById("nav_container").style.marginTop = topM;
		
	} else {
		document.getElementById("background").style.marginTop = "-400px";
		document.getElementById("nav_container").style.marginTop = "-400px";	}

	if(myWidth < 1200) {
		leftM = (myWidth / 2) * -1 + "px";
		document.getElementById("background").style.marginLeft = leftM;
		document.getElementById("nav_container").style.marginLeft = leftM;
	} else {
		document.getElementById("background").style.marginLeft = "-600px";
		document.getElementById("nav_container").style.marginLeft = "-600px";
	}
	
}
window.onresize = resize;