application.js

/**
* Methods for extending Prototype
*/
var Position = {
/**
* Centers an element against the parent or body
* parent should be display: relative
*/
center: function(elem, parent){
 
var elem = $(elem);
var parent;
var dims = elem.getDimensions();
var scroll = document.viewport.getScrollOffsets();
var bgDims;
 
if(parent){
bgDims = $(parent).getDimensions();
} else {
bgDims = document.viewport.getDimensions();
}
 
var t = parseInt( ( ( ( bgDims.height ) - dims.height) / 2 ), 10);
var l = parseInt( ( ( ( bgDims.width ) - dims.width) / 2 ), 10 );
 
elem.setStyle({
position: 'absolute',
top: t + scroll.top + 'px',
left: l + scroll.left + 'px'
});
},
 
/**
* Used to keep ensure an element stays within a scrollable div
*/
keepWithin: function(elem, parent, padding){
elem = $(elem);
parent = $(parent);
padding = padding || 0;
 
// return if no scrollbars
if(parent.scrollHeight < 1) return elem;
 
var elemViewportBottom = elem.getBoundingClientRect().bottom.ceil();
var parentViewportBottom = parent.viewportOffset().top + parent.getHeight();
 
if(parentViewportBottom < elemViewportBottom)
parent.scrollTop = elemViewportBottom - parentViewportBottom + padding;
 
return elem;
}
};
 
Element.addMethods(Position);

Draggable.prototype.initialize = Draggable.prototype.initialize.wrap(function(callOriginal, el){
  var ret = callOriginal(el, {handle: 'head'});
  var boddy = $$('body')[0];
  this.element.center(document.body);
  var iframe = Element.insert(this.element, {after: new Element('iframe', {style: 'position:absolute; z-index:20;', 
      id: "popup_bg", frameborder: "0", scrolling: "no"}) 
  });
  document.enabled = false;
  this.element.show();
  Element.clonePosition('popup_bg', this.element);
  this.element.select('.close').each(function(close_el){
    close_el.observe('click', function(event){
      $$('.reset').each(function(el){el.reset()})
      var dragable = this.up('.dragable');
      Draggables.destroy(dragable);
      event.stop();
    });
  })
  this.element.observe('keypress', formSubmitOnEnter);
  return ret;
})