Validate Phone Number Field in MS CRM

/***********************************************************************************************
*******************************Validate Phone Number Field**************************************
/***********************************************************************************************/
function ValidatePhoneNumber() {
// Binding the events to crm field, which needs to be validated
crmForm.all.<FieldName>.onkeypress = isvalidPhone;

}
// Allows to enter only Numbers & upto 10 char’s
function isvalidPhone() {

var charCode = event.keyCode;
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;

var phnum = event.srcElement.value.replace(/[^0-9]/g, “”);

if (phnum.length >= 10)
return false;
return true;
}

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