$(document).ready(function(){

	var button = $('#upload_btn'), interval;
	new Ajax_upload(button,{
		action: 'admin/article_upload_picture.php', 
		name: 'myfile',
		onSubmit : function(file, ext){	
			button.val('Uploading');
			
			//uploading only 1 file at time
			this.disable();
			
			// Uploading -> Uploading. -> Uploading...
			interval = window.setInterval(function(){
				var text = button.val();
				if (text.length < 13){
					button.val(text + '.');					
				} else {
					button.val('Uploading');				
				}
			}, 200);
		},
		onComplete: function(file, response){
			button.val('Upload Picture');
						
			window.clearInterval(interval);
						
			// enable upload button
			this.enable();

			if(response.indexOf(id) < 0) {
				alert(response);
			}
			else {
				$('#picture_array').val(response);
				picture_array = response.split(';');
				$('#article_picture').attr("src",tmp_path+picture_array[0]).fadeIn('slow');
			}
		}
	});
});