menu hover on touch-able device

gistfile1.js

//MENU HOVER ON TOUCH-able DEVICE
if( 'ontouchstart' in document.documentElement ){
	var clickable = null;
	$('.touchable').each(function(){
		var $this = $(this);

		if( $this.find('ul.sub-menu').length > 0 ){

			$this.find('a:first').unbind('click').bind('touchstart',function(event){
				if( clickable != this ){
					clickable = this;
					event.preventDefault();
				}else{
					clickable = null;
				}
			});
		} 

	});
	
}
// END MENU HOVER ON TOUCH-ABLE DEVICE