function heightFix() {
	var hMain = document.getElementById('main-layer').offsetHeight;
	var minHeight = 550;
	
	if( hMain < minHeight ) {
		document.getElementById('main-layer').style.height = minHeight+"px";
	}
	else if (hMain > 1000) {
		document.getElementById('main-layer').style.height = (hMain+70)+"px";	
	}
	else {
		document.getElementById('main-layer').style.height = hMain+"px";
	}
}