mobile number validate in dynamic crm 2011

for this refer:
http://blog.arkesystems.com/post/2011/06/22/Parsing-and-Validating-Phone-Numbers-in-CRM-2011.aspx

http://rudravarmabata.blogspot.in/2012/05/mobile-number-validation-using-regex.html

function validatePhone(context)
{

var phone =context.getEventSource().getValue();
var sTmp = phone.replace(/[^0-9]/g, "");
phoneRegex = /^\d{10}$/;

if( !sTmp.match( phoneRegex ) )
   {
   event.returnValue = false;
   alert("Phone must contain 10 numbers.") ;
   }
else
  {
   var sTmpClean =  "(" + sTmp.substr(0, 3) + ") " + sTmp.substr(3, 3) + "-" + sTmp.substr(6, 4);
   context.getEventSource().setValue(sTmpClean);
  }
}

give this javascript and check the field pass the parameters in onchage form.