function clear_field( elem )
{
	if( elem.value == elem.defaultValue )
	{
		elem.value = '';
	}
}

function success(msg){
	alert(msg);
}

function warn(){
	alert(msg);
}

function aj(url,container,js_function)
{
	
	var containers = container.split("/");
	
	$(".ajax_loader").show();
	
		try{
		$.post( url , '' , function( data ){
			
			var json = data;
			
			for( var i = 0 ; i < json.response.length; i++ )
			{
				
				switch( json.response[i].type )
				{
					case 'HTML':
						$( containers[i] ).html( json.response[i].data );	
						break;
					case 'SUCCESS':
						success( json.response[i].data );
						break;
					case 'WARNING':
						warn( json.response[i].data );
						break;
					case 'JSCRIPT':
						eval( json.response[i].data );
						break;
				}
				
			}
			
			$('.ajax_loader').hide();
			
		},'json');
	}
	catch(e){
		warn(e);
		$('.ajax_loader').hide();
	}
	
	return false;
	
	/*
	$.get(url, function(data){
		if( container != null ){
			$(container).html(data);	
		}	
		if (js_function != null) {
			eval(js_function);
		}
		$(".ajax_loader").hide();
	});
	return false;
	*/
}

function atb(url,container,id){
	var qty = 1;
	if( $('#qty_'+id).val() != undefined ) qty = $('#qty_'+id).val();
	return aj( url + '&qty=' + qty, container );
}

$(document).ready(function(){
	$('.qty').focus(function(){
		clear_field(this);
	});
});