function kapat(obj,obj2) {
	var el = document.getElementById(obj);
	var el2 = document.getElementById(obj2);
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
		el2.style.display = '';
	}
	else {
		el.style.display = '';
		el2.style.display = 'none';
	}
}
function clearText(field)
{
    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;
}