/**
 * Convert a single file-input element into a 'multiple' input list
 *
 * Usage:
 *
 *   1. Create a file input element (no name)
 *      eg. <input type="file" id="first_file_element">
 *
 *   2. Create a DIV for the output to be written to
 *      eg. <div id="files_list"></div>
 *
 *   3. Instantiate a MultiSelector object, passing in the DIV and an (optional) maximum number of files
 *      eg. var multi_selector = new MultiSelector( document.getElementById( 'files_list' ), 3 );
 *
 *   4. Add the first element
 *      eg. multi_selector.addElement( document.getElementById( 'first_file_element' ) );
 *
 *   5. That's it.
 *
 *   You might (will) want to play around with the addListRow() method to make the output prettier.
 *
 *   You might also want to change the line 
 *       element.name = 'file_' + this.count;
 *   ...to a naming convention that makes more sense to you.
 * 
 * Licence:
 *   Use this however/wherever you like, just don't blame me if it breaks anything.
 *
 * Credit:
 *   If you're nice, you'll leave this bit:
 *  
 *   Class by Stickman -- http://www.the-stickman.com
 *      with thanks to:
 *      [for Safari fixes]
 *         Luis Torrefranca -- http://www.law.pitt.edu
 *         and
 *         Shawn Parker & John Pennypacker -- http://www.fuzzycoconut.com
 *      [for duplicate name bug]
 *         'neal'
 */
function MultiSelector( list_target, max, button_text ){

	// 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;
	};
	this.button_text = button_text;
	



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

		

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

			

// Element name -- what number am I?
		
element.name = 'upload[]' ;

			

// 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';

		
// 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' );



// Delete button
var new_row_button = document.createElement( 'input' );
		
new_row_button.type = 'button';
		
new_row_button.value = 'Remove';

		
// References
		new_row.element = element;

		
// Delete function
		
new_row_button.onclick= function(){

			
// Remove element from form
			
this.parentNode.element.parentNode.removeChild( this.parentNode.element );

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

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

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

			
// Appease Safari
			return false;
		
};

		

// Set row value
		
element_work = element.value;
		
element_tab = element_work.split("\\");
		
nbr_elements = element_tab.length;
		
		

file_typ = element_tab[nbr_elements-1].split(".");
		
		

if(file_typ[1] == "jpg" || file_typ[1] == "jpeg" || file_typ[1] == "gif" || file_typ[1] == "png" || file_typ[1] == "bmp" || file_typ[1] == "JPG" || file_typ[1] == "JPEG" || file_typ[1] == "GIF" || file_typ[1] == "PNG" || file_typ[1] == "BMP")
 {

var browser=navigator.appName

if(browser=="Microsoft Internet Explorer"){
new_row.innerHTML = element_tab[nbr_elements-1] + "<br /><img src=\"file:/" + element.value + " \" width='120' border='0'>&nbsp;&nbsp;";

}
else {
new_row.innerHTML = element_tab[nbr_elements-1] + "&nbsp;&nbsp;";

}

// Add button


new_row.appendChild(new_row_button );
	

// Add it to the list
	

this.list_target.appendChild( new_row );
		
}
	
};


};