function setHeight()
{
	//get current height of both div's
	var rightHeight = document.getElementById('sidebar').offsetHeight; 
	var leftHeight = document.getElementById('main_column').offsetHeight;
	
	//alert(leftHeight+"  "+rightHeight);
	
	if (leftHeight < rightHeight ) // if left one is smaller 
	{

		document.getElementById('main_column').style.height = rightHeight + 'px'; // make the left one equal to left one
	}
	else // left one is not smaller 
	{
		document.getElementById('sidebar').style.height = leftHeight + 'px'; // so make the right one equal to left
	}

}