$(document).ready(
				  function() {
					  $('.md_select_variant').change(function(){
														 loadVariants(this);
														 });
});

function loadVariants(obj) {
	var new_id = obj.options[obj.selectedIndex].value;
	var old_id = obj.id;
	old_id = old_id.replace( 'mdvariantselect_', '');
	
	old_id = old_id.substring( old_id.length - 32);
	
	for ( var i= 0; i < obj.options.length; ++i)
	{
		if ( obj.options[i].value == old_id)
		{
			obj.options[i].selected = true;
		}
	}
	
	$('#details_' + old_id).addClass('display_none');
	$('#details_' + new_id ).removeClass('display_none');
};