function resizediv() {
	var divHeight1 = document.getElementById('leftcolumn').offsetHeight;
	var divHeight2 = document.getElementById('rightcolumn').offsetHeight;

	if (divHeight1 > divHeight2) {
		var divhoehe = divHeight1;
	} else {
		var divhoehe = divHeight2;
	}

	document.getElementById('content').style.height=divhoehe+'px';
	document.getElementById('leftcolumn').style.height=divhoehe+'px';
	document.getElementById('space1').style.height=divhoehe+'px';
	document.getElementById('rightcolumn').style.height=divhoehe+'px';
	document.getElementById('space2').style.height=divhoehe+'px';
}