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This is a hacked version of Ajaxupload plugin created by, which is really good enought for normal use.
In this hacked version, it submits the specified file type of input element only, so we don't bother with extra form fields.
how to use it?
1. include jquery.js & ajaxfileupload.js javascript files
2. create a function to be fired when the upload button clicked. 
  e.g.
	function ajaxFileUpload()
	{
		//starting setting some animation when the ajax starts and completes
		$("#loading")
		.ajaxStart(function(){
			$(this).show();
		})
		.ajaxComplete(function(){
			$(this).hide();
		});
		
		/*
			prepareing ajax file upload
			url: the url of script file handling the uploaded files
                        fileElementId: the file type of input element id and it will be the index of  $_FILES Array()
			dataType: it support json, xml
			secureuri:use secure protocol
			success: call back function when the ajax complete
			error: callback function when the ajax failed
			
                */
		$.ajaxFileUpload
		(
			{
				url:'doajaxfileupload.php', 
				secureuri:false,
				fileElementId:'fileToUpload',
				dataType: 'json',
				success: function (data, status)
				{
					if(typeof(data.error) != 'undefined')
					{
						if(data.error != '')
						{
							alert(data.error);
						}else
						{
							alert(data.msg);
						}
					}
				},
				error: function (data, status, e)
				{
					alert(e);
				}
			}
		)
		
		return false;

	}  