function matchHeight() {

var maxHeight = 0;

var cont = document.getElementById('content');

var leftch = document.getElementById('left').offsetHeight;
var middlech = document.getElementById('middle').offsetHeight;
var rightch = document.getElementById('right').offsetHeight;

var heights = new Array(leftch, middlech, rightch);

for (i in heights)
{
	if (heights[i] > maxHeight)
		maxHeight = heights[i];
}

cont.style.height = maxHeight + 'px';
}