function setEqualHeight(columns)  
{  
	var tallestcolumn = 0;  
	columns.each(  
		function()  
		{  
			currentHeight = $(this).height();  
			if(currentHeight > tallestcolumn)  
			{  
				tallestcolumn  = currentHeight;  
			}  
		}  
	);
	
	columns.height(tallestcolumn);  
}

$(document).ready(function() {  
	setEqualHeight($(".middle  > div"));  
});