function validate (obj, correct) {
	for (var i = 0; i <=correct.length; i++) {
		var correctChar = correct.charAt(i)
		var objChar = obj.value.charAt(i)
		if (objChar != correctChar) {
			break;
		}
		document.forms[0].temporary.value= correct.substring (0, i+1)
		}
		obj.value=document.forms[0].temporary.value
}