function valid_check(variable,divclass){
	if (variable.checked==true){
		var elementy = document.getElementById(divclass).getElementsByTagName("input");
		for (var i = 0; i < elementy.length; i++) {
		var tag = elementy[i];
		if (tag.checked) tag.checked=false;
		}
	variable.checked=true;
	}
}