With out Clearing the Variable values Qv Portal

[#1]

When the user hits the clear button variable values are clearing.

I am using the below code in the macro

Sub t1

val = ActiveDocument.Variables("vCust").GetContent.String

I don't want to clear the variable value  if the user hits the Clear button..

Advance thanks for your  help and support.

ActiveDocument.Fields("CustomerNo").Select "*"&val&"*",true

end sub

vCust is the varaible