function resizeHeight() {
	
var topcontainer = document.getElementById('content-top');
var bottomcontainer = document.getElementById('content-bottom');

	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;
	}

var countedsize = (myHeight - 586) / 2;

	topcontainer.style.height = countedsize+'px';
	bottomcontainer.style.height = countedsize+'px';
}

resizeHeight();
window.onresize = resizeHeight;