Using javascript to read bex variables in WAD

Hello,
I'm using BI 7.0.
In Query Designer I defined a variable of type customer exit. The variable is called "TESTVAR". How can I access to the value of this variable in WAD by using javascript? I know I can use the Web Item "Script" or I can include the javascript code in an external file. But can you can give me some example code how I can access the variable "TESTVAR"?
thanks
bertl

Try using the following
Suppose <b>TESTVAR</b> is having the value <b>A</b>
If TESTVAR is single value
var_name_1=TESTVAR
VAR_VALUE_EXT_1 = A
if TESTVAR is range
var_name_1=TESTVAR
VAR_VALUE_LOW_EXT_1 = A
VAR_VALUE_HIGH_EXT_1 = A

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