jQuery.extend({
    createUploadIframe: function(id, uri)
	{
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io			
    },
    createUploadForm: function(id,s)
	{
		var formId = 'jUploadForm' + id;
		var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data" onsubmit=""></form>');
		var oldElement = '';
		var newElement = '';
		$(s.form_id+" input").each(function(i){
			oldElement = $(this);
			newElement = $(oldElement).clone();
			$(oldElement).attr('id', this.name);
			$(oldElement).before(newElement);
			$(oldElement).appendTo(form);
		});
		$(s.form_id+" select").each(function(i){
			oldElement = $(this);
			newElement = $(oldElement).clone();
			$(oldElement).attr('id', this.name);
			$(oldElement).before(newElement);
			$(oldElement).appendTo(form);
		});
		$(s.form_id+" textarea").each(function(i){
			oldElement = $(this);
			newElement = $(oldElement).clone();
			$(oldElement).attr('id', this.name);
			$(oldElement).before(newElement);
			$(oldElement).appendTo(form);
		});
		$(form).css('position', 'absolute');
		$(form).css('top', '-1200px');
		$(form).css('left', '-1200px');
		$(form).appendTo('body');
		return form;
    },
    ajaxFileUpload: function(s) {		
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime();    
		var form = jQuery.createUploadForm(id,s);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;		
        if ( s.global && ! jQuery.active++ )
		{
			jQuery.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        var xml = {}   ;
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        var uploadCallback = function(isTimeout)
		{			
			var io = document.getElementById(frameId);
            try 
			{				
				if(io.contentWindow)
				{
					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
					 
				}else if(io.contentDocument)
				{
					 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}						
            }catch(e)
			{
				jQuery.handleerror(s, xml, null, e);
			}
            if ( xml || isTimeout == "timeout") 
			{				
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    if ( status != "error" )
					{
                        var data = jQuery.uploadHttpData( xml, s.dataType,s ,frameId);    
                        if ( s.success )
                            s.success( data, status );
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
					{
                        jQuery.handleerror(s, xml, status);
					}
                } catch(e) 
				{
                    status = "error";
                    jQuery.handleerror(s, xml, status, e);
                }if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );
                if ( s.complete )
                    s.complete(xml, status);
                jQuery(io).unbind();
                setTimeout(function()
									{	try 
										{
											$(io).remove();
											$(form).remove();	
											
										} catch(e) 
										{
											jQuery.handleerror(s, xml, null, e);
										}									

									}, 100);

                xml = null;

            }
        };
		if ( s.timeout > 0 ) {
            setTimeout(
					   function()
					   {
                			if( !requestDone ) {uploadCallback( "timeout" );}
            			}
						, s.timeout);
        }
		try 
		{
			var form = $('#' + formId);
			$(form).attr('action', s.url);
			$(form).attr('method', 'POST');
			$(form).attr('target', frameId);
            if(form.encoding)
			{
                form.encoding = 'multipart/form-data';				
            }
            else
			{				
                form.enctype = 'multipart/form-data';
            }
            $(form).submit();
        } catch(e) 
		{			
            jQuery.handleerror(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        } 		
        return {abort: function () {}};	

    },
    uploadHttpData: function( r, type ,s,frameId) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        if ( type == "script" )
            jQuery.globalEval( data );
        if ( type == "json" )
            eval( "data = " + data );
        if ( type == "html" )
            jQuery(s.target_id).html(data);
        return data;
    }
});