function ResizeDivs() {

	var divheight = 0;
	var height1 = document.getElementById('columnLeft').offsetHeight;
	var height2 = document.getElementById('columnCenter').offsetHeight;
	var height3 = document.getElementById('columnRight').offsetHeight;
	
	if (height1 >= height2) {
		divheight = height1;
	} else {
		divheight = height2;
	}
	if (height3 >= divheight) {
		divheight = height3;
	}
	
	document.getElementById('columnLeft').style.height = divheight+'px';
	document.getElementById('columnCenter').style.height = divheight+'px';
	document.getElementById('columnRight').style.height = divheight+'px';
	
	divheight += document.getElementById('header').offsetHeight;

	document.getElementById('master').style.height = divheight+'px';
	
}