function numbersonly(myfield, e, dec){
var key;
var keychar;

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) || 
    (key==9) || (key==13) || (key==27) )
   return true;

// numbers
else if ((("0123456789").indexOf(keychar) > -1))
   return true;

// decimal point jump
else if (dec && (keychar == "."))
   {
   myfield.form.elements[dec].focus();
   return false;
   }
else
   return false;
}


 function validation(){
	
    phone = document.formphone.msisdn.value;
	
   if (phone == ""){
	   alert("You must insert your full mobile number.")
	   return false;
   }
   else if (phone.substring(0,2) != "04"){
   	   alert("Your mobile phone number must start with 04.")
	   return false;
   }
   else if (phone.length != 10){
   	   alert("The number you submitted is incomplete. Please check you have entered all 10 digits.")
	   return false;
   }
   else{
	document.frm.submit();
   }
}