var caption_login = "логин";
var caption_pass = "~~~~~~";
var caption_search = 'Поиск в каталоге...';

function login_onfocus() {
	var input_login = document.getElementById("input_login");
	if (input_login.value == caption_login) input_login.value = "";
}
function pass_onfocus() {
	var input_pass = document.getElementById("input_pass");
	if (input_pass.value == caption_pass) input_pass.value = "";
}
function search_onfocus() {
	var input_search = document.getElementById("input_search");
	if (input_search.value == caption_search) input_search.value = "";
}
function limitText(limitField, limitCount, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
    } else {
        limitCount.value = limitNum - limitField.value.length;
    }
}