jQuery(document).ready(function($) { 

/* code */

	function equalHeight(group) {
	    tallest = 0;
	    group.each(function() {
	        thisHeight = $(this).height();
	        if(thisHeight > tallest) {
	            tallest = thisHeight;
	        }
	    });
	    group.height(tallest);
	}
	
	equalHeight($(".maincolumn"));
	
});