function MultiSelector( list_target, max ){
this.list_target = list_target;
this.count = 0;
this.id = 0;
if( max ){
this.max = max;
} else {
this.max = -1;
};
this.addElement = function( element ){
if( element.tagName == 'INPUT' && element.type == 'file' ){
element.name = 'file_' + this.id++;
element.multi_selector = this;
element.onchange = function(){
var new_element = document.createElement( 'input' );
new_element.type = 'file';
this.parentNode.insertBefore( new_element, this );
this.multi_selector.addElement( new_element );
this.multi_selector.addListRow( this );
this.style.position = 'absolute';
this.style.left = '-1000px';
};
if( this.max != -1 && this.count >= this.max ){
element.disabled = true;
};
this.count++;
this.current_element = element;
} else {
alert( 'Error: not a file input element' );
};
};
this.addListRow = function( element ){
var new_row = document.createElement( 'div' );
var new_row_button = document.createElement( 'a' );
new_row_button.setAttribute("href", "#");
new_row.element = element;
new_row_button.onclick= function(){
this.parentNode.element.parentNode.removeChild( this.parentNode.element );
this.parentNode.parentNode.removeChild( this.parentNode );
this.parentNode.element.multi_selector.count--;
this.parentNode.element.multi_selector.current_element.disabled = false;
return false;
};
var c = element.value.lastIndexOf('\/');
if (c != -1)
html = element.value.substring(c+1);
else {
var c = element.value.lastIndexOf('\\');
if (c != -1)
html = element.value.substring(c+1);
else
html = element.value;
}
new_row.appendChild( new_row_button );
var new_row_text = document.createElement( 'span' );
new_row.appendChild(new_row_text);
new_row_text.innerHTML = html;
this.list_target.appendChild( new_row );
};
};