function array_diff (array) {	// Computes the difference of arrays
	// 
	// +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

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

	// 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;
			for (key_c in argv[i]) {
				if (argv[i][key_c] == array[key]) {
					found = true;
					break;
				}
			}

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

	return arr_dif;
}