var digits="0123456789"
var temp  
 
 
if (form.SSN3.value=="") {
  alert("Please enter your Social Security Number.")
  form.SSN3.focus();
  return false;
 }
 for (var i=0;i<form.SSN3.value.length;i++){
  temp=form.SSN3.value.substring(i,i+1)
  if (digits.indexOf(temp)==-1){
   alert("Only numbers are accepted in Social Security Number.")
   form.SSN3.focus();
  return false;
  }
  }

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