function form_check(formname) {
	eval('var thisform = document.'+formname+';');

	for (i=0;i<thisform.elements.length;i++) {
		if (
			(thisform.elements[i].name.substr(0, 4) == 'kot_') &&
			(
				(thisform.elements[i].type == 'text') ||
				(thisform.elements[i].type == 'password') ||
				(thisform.elements[i].type == 'textarea')
			)
		) {
			if ((thisform.elements[i].value != undefined) && (thisform.elements[i].value == '')) {
				alert('Adja meg a kötelező mező értékét!');
				thisform.elements[i].focus();
				return false;
			}
		}
	}
	return true;
}