function array_diff_assoc ( array ) {	// Computes the difference of arrays with additional index check
	// 
	// +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

	var arr_dif = {}, i = 1, argc = arguments.length, argv = arguments, key, key_c, found=false;

	// input sanitation
	if( !array || (array.constructor !== Array && array.constructor !== Array && typeof array != 'object' && typeof array != 'array') ){
		return null;
	}

	// loop through 1st array
	for ( key in array ){
		// loop over other arrays
		for (i = 1; i< argc; i++){
			// find in the compare array
			found = false;
			if(argv[i][key]){
				found = true;
				break;
			}

			if(!found){
				arr_dif[key] = array[key];
			}
		}
	}

	return arr_dif;
}