function validate(){

var digits="0123456789"
var temp

if (document.submitform.User_Name.value=="") {
alert("No User Name!")
return false
}

if (document.submitform.User_Email.value=="") {
alert("Your E-mail, please!")
return false
}


for (var i=0;i<document.submitform.Phone.value.length;i++){
temp=document.submitform.Phone.value.substring(i,i+1)
if (digits.indexOf(temp)==-1){
alert("Invalid Phone Number!")
return false
      }
   }
return true
}