jQuery(document).ready(function () { 

    // set col main height
    
    jQuery('img').load(function () { 
        var col_main = jQuery('.col-left');
        var col_main_height = col_main.height();
        var col_right = jQuery('.col-main');
        var col_right_height = col_right.height();
        var col_left = jQuery('.col-right');
        var col_left_height = col_left.height();
        
        var sizes_array = [col_main_height, col_right_height, col_left_height];
        
        var biggest_size = Math.max.apply( null, sizes_array );
        
        if(col_main_height < biggest_size)
            jQuery('.col-main').css('min-height', biggest_size+'px');
    })
    
});