function size() {

		var a = document.getElementById('art1').offsetHeight;
		var b = document.getElementById('header').offsetHeight;
		var c = document.getElementById('photo').offsetHeight;
		
		if ( a > b) {
			document.getElementById('photo').style.height = a +"px";
		} else if (a < b) {
			document.getElementById('photo').style.height = b +"px";
		} else {
			document.getElementById('photo').style.height = c +"px";
		}
		
	}