Java script validation for Custom button

Below code used for validating the object values on various criteria. User has to select the Display Type  = "Detail Page Button"  ,  Behavior = "Execute Javascript" ,Content Source = "On click JavaScript"  and finally we need to write our validation logic inside region .


if("{!testObject.RecordType}"  == "Test Record Type")
{

if("{!testObject.StageName__c}" == 'Lead' || "{!testObject.StageName__c}" == 'Trusted Listing' || "{!testObject.StageName__c}" == 'Signed Listing' || "{!testObject.StageName__c}" == 'Escrow')
{
 if("{!testObject.Field1__c}" != 0.00 && "{!testObject.Field2__c}" !=  0)
 {
window.location.href="/apex/TestPage?id="+"{!testObject.Id}";
 }
 else
 {
  alert('Field1__c and/or Field2__c  are not defined');
 }
}
else
{
 alert('Deal Stage is either Closed , Closed Lost or Cancelled')
}

}
else
{
  alert('Deal should have Record Type Test Record Type One');

}