function isEmpty(str) {
	for (var i = 0; i < str.length; i++)
	if (" " != str.charAt(i))
	return false;
	return true;
}

function isMail(str){
	if((/^([a-z0-9_\-]+\.)*[a-z0-9_\-]+@([a-z0-9][a-z0-9\-]*[a-z0-9]\.)+[a-z]{2,4}$/i).test(str))
	return true;
	else return false;
}

function checkfields(oForm) {
	var result = true;
	var el;
	for (var i = 0; i<oForm.elements.length; i++){ 
		el = oForm.elements[i];
		if (null!=el.getAttribute("required") || el.name.search('mail')!=-1){ 
			if (null!=el.getAttribute("required") && isEmpty(el.value)){
				document.getElementById(el.name+'-err').innerHTML = "Îøèáêà!";
				result = false;
			} else if(el.name.search('mail')!=-1 && !isEmpty(el.value) && !isMail(el.value)){
				document.getElementById(el.name+'-err').innerHTML = "Îøèáêà!";
				result = false;
			} else document.getElementById(el.name+'-err').innerHTML = "";

		}
	}
	if(null!=oForm.pfobnf1){
		if(oForm.pfobnf1.checked){
			document.getElementById('pfobnf-err').innerHTML = "Îøèáêà!";
			result = false;
		} else document.getElementById('pfobnf-err').innerHTML = "";
		
	}
	return result;
}