function chk(f)
{
var radio_choice=false;
for (counter = 0; counter < f.StoneColor.length; counter++)
{
	if (f.StoneColor[counter].checked)
	radio_choice = true; 
}

if(f.custext1.value=="" || !radio_choice )
{
	alert("Please enter all mandatory fields before continuing");
	return false;
}
return true;

}