function array_push(arr) {
	for (var i = 1; i < arguments.length; i++) {
		arr.push(arguments[i]);
	}
	return arr.length
}

arr1 = new Array("dog", "cat", "mouse");
total = array_push(arr1, "gopher", "shrew");
alert(total); /* Returns: 5 */
alert(arr1); /* Returns: dog,cat,mouse,gopher,shrew */