First u take the window name into variable. in the script u 
replace the property value with the variable. we can do 
this in DP. a variable name (i.e. the property value, which 
is changing dynamically, will be in the variable) can be 
given as the property value of a property. ex : 

browser(xxxx).page("title:=" &variablename).xxxxxx

now it takes what ever the window name/page name is.
i have not written the script properly. i said a way how we 
can do this. so analize this n get better solution. i m not 
100% clear with this solution ,but in this way we can do 
this.  correct me if i m wrong.

When u Entered the Details of the customer in New Customer 
Window when u press submit button\else to procced then it 
can opens the window as customer names window right
 means u can retrive the name of customer 
var=browser(****).page(***).winedit("cuname").GetRoProperty
("text")

now compare the retrived value with window name.

The Answer given by "Guest" is acceptable...
The scenario is- the window name is dynamically getting 
changed, solution could be
you can use "Regular expression" method....
First you open the Repository and check the window property 
as "Type" and for that "type" property value-chenge the 
constant to a regular expression. I think you know the 
process......if not follow this, at the bottom of the 
repository window
you find two edit boxes namely...CONSTANT and PARAMETER.
right beside at the CONSTANT Edit box you find a small Icon 
kind of thing and click that, set the regular expression 
check box on (tick on that).

if it doesn't work...
then go to the ADD/REMMOVE OBJECTS, where you can look for 
a property called "href" then give the property value as 
the window URL (http:/********) then try..
if this also doesn't work...
you can go for another method to make the QTP to identify 
the destination page rather than the window..
I can not type all that 
u just try these two methods they don't-then mail me at
sivaprasadnunna79@yahoo.co.in I will help you
all the best.