jQuery.fn.exists = function(){return this.length>0;};

$(document).ready(function(){
	init();
});

function init()
{
	//setting max columns height on first page
	if($(".mid-1").exists())
	{
		var height1 = $(".mid-1").height();
		var height2 = $(".mid-2").height();
		var height3 = $(".mid-3").height();
		
		var max_height = Math.max(height1,height2, height3);
		
		$(".mid-1").height(max_height);
		$(".mid-2").height(max_height);
		$(".mid-3").height(max_height);
	}
}