// vertical positioning in the viewport
(function($){
  $.fn.vCenter = function(options) {
    var pos = {
      sTop : function() {
        return window.pageYOffset || document.documentElement && document.documentElement.scrollTop ||	document.body.scrollTop;
      },
      wHeight : function() { 
        return window.innerHeight || document.documentElement && document.documentElement.clientHeight || document.body.clientHeight;
      }
    };
    return this.each(function(index) {
      if (index == 0) {
        var $this = $(this);
        var elHeight = $this.height();
		    var elTop = pos.sTop();// + (pos.wHeight() / 2) - (elHeight / 2);
        $this.css({
          position: 'absolute',
          marginTop: '0',
          top: elTop
        });
      }
    });
  };

/**
 * Checkboxes extend function
 * 
 * Example
 * $("input[@type='checkbox']").check();
 * $("input[@type='checkbox']").check('on');
 * $("input[@type='checkbox']").check('off');
 * $("input[@type='checkbox']").check('toggle');
 */
$.fn.check = function(mode) {
	var mode = mode || 'on'; // if mode is undefined, use 'on' as default
	return this.each(function() {
		switch(mode) {
		case 'on':
			this.checked = true;
			break;
		case 'off':
			this.checked = false;
			break;
		case 'toggle':
			this.checked = !this.checked;
			break;
		}
	});
};
})(jQuery);