function extractFileName(fullpath)
{
    var maxlength = 40;
    if (fullpath.length > maxlength)
        return '...' + fullpath.substring(fullpath.length - maxlength - 3, fullpath.length);
    else
        return fullpath;
}

function removefile(el)
{
    // Remove element from form
    el.parentNode.element.parentNode.removeChild(el.parentNode.element);

    // Remove this row from the list
    el.parentNode.parentNode.removeChild(el.parentNode);

    // Decrement counter
    el.parentNode.element.multi_selector.count--;

    // Re-enable input element (if it's disabled)
    el.parentNode.element.multi_selector.current_element.disabled = false;

    // Appease Safari
    //    without it Safari wants to reload the browser window
    //    which nixes your already queued uploads
    return false;
}

function MultiSelector( list_target, max ){

	// Where to write the list
	this.list_target = list_target;
	// How many elements?
	this.count = 0;
	// How many elements?
	this.id = 0;
	// Is there a maximum?
	if( max ){
		this.max = max;
	} else {
		this.max = -1;
	};

	/**
	 * Add a new file input element
	 */
	this.addElement = function( element ){

		// Make sure it's a file input element
		if( element.tagName == 'INPUT' && element.type == 'file' ){

			// Element name -- what number am I?
			element.tag = this.id++;
			element.name = 'file_' + element.tag;

			// Add reference to this object
			element.multi_selector = this;

			// What to do when a file is selected
			element.onchange = function(){

				// New file input
				var new_element = document.createElement( 'input' );
				new_element.type = 'file';
                new_element.size = "35";

				// Add new element
				this.parentNode.insertBefore( new_element, this );

				// Apply 'update' to element
				this.multi_selector.addElement( new_element );

				// Update list
				this.multi_selector.addListRow( this );

				// Hide this: we can't use display:none because Safari doesn't like it
				this.style.position = 'absolute';
				this.style.left = '-1000px';
			};

			// If we've reached maximum number, disable input element
			if( this.max != -1 && this.count >= this.max ){
				element.disabled = true;
			};

			// File element counter
			this.count++;
			// Most recent element
			this.current_element = element;

		} else {
			// This can only be applied to file input elements!
			alert( 'Error: not a file input element' );
		};

	};

	/**
	 * Add a new row to the list of files
	 */
	this.addListRow = function( element ){

		// Row div
		var new_row = document.createElement( 'div' );

		// References
		new_row.element = element;

		// Set row value
        str = "<br>Description (optional):<br><input type='text' name='desc" + element.tag  + "' size=35><br>";
		new_row.innerHTML = "<br><input type='button' value='remove' style='font-size: 8pt' onclick='return removefile(this);'>&nbsp;&nbsp;<span STYLE='color: blue'>File: " + extractFileName(element.value) + "</span>";

		// Add button
		new_row.innerHTML = new_row.innerHTML + str;

		// Add it to the list
		this.list_target.appendChild( new_row );

	};

};