javascript-validate-radio-button
rdDisplaySizeValid = -1;
for( i=0; i< f.elements["rdDisplaySize"].length; i++)
{
if( f.elements["rdDisplaySize"][i].checked ){ rdDisplaySizeValid = 1; }
}
if( rdDisplaySizeValid == -1 )
{
alert("Please choose a Display size.");
f.elements["rdDisplaySize"][0].focus();
return;
}