function checkEmpty(elId) {
	var el = document.getElementById(elId);
	return (null != el) && (el.value != "");
}

function checkEmptyLCZ(elId) {
	return (checkEmpty(elId+"_ru") && checkEmpty(elId+"_en"));
}

function checkEmptySel(elId) {
	var el = document.getElementById(elId);
	return (null != el) && (el.selectedIndex != -1) && (el.options[el.selectedIndex].value != "");
}

function checkRadio(elId) {
	var el = document.getElementById(elId);
	return (null != el) && el.checked;
}

function checkEmail(elId) {
	var el = document.getElementById(elId);
	var emailReg = "^[\\w-_\.]*[\\w-_\.]\@[\\w]\.+[\\w]+[\\w]$";
	var regex = new RegExp(emailReg);
	return (null != el) && regex.test(el.value);
}

function disable(elId) {
	var el = document.getElementById(elId);
	if (el != null)
	{
		el.disabled = true;
	}
}

function enable(elId) {
	var el = document.getElementById(elId);
	if (el != null)
	{
		el.disabled = false;
	}
}

function reset(elId) {
	var el = document.getElementById(elId);
	if (el != null)
	{
		el.disabled = !el.disabled;
	}
}
function checkDif(elId1,elId2){
	var el1 = parseFloat(document.getElementById(elId1).value);
	var el2 = parseFloat(document.getElementById(elId2).value);
	return	(el1<=el2);	

}