Replacing 'None' with 'Please Select' in select box : Catalog Item

[asasas]

I have a variable in Catalog item "e-transfer Inquiry type" which is select box type and mandatory field.

When I   tick check box" Include None"   that option is added in select box(as shown above )

That I want is:   I want to replace "--None--" With "--Please Select--" option

can someone help.

[Kalaiarasan Pus]

g_form.addOption('variablename', '', '--Please Select--', 0);

g_form.setValue('variablename','');

[UttamPundir]

You can go to the Variable Default value and you can set it as "--Please Select--"