Search with only selected prefix ids

[zigi]

Hi everyone,

  

Im trying to change searching prefix option by using only selected prefixes not all of them. As i understood this is indicated at search.php line 1527:

Code:

$prefixselect = build_prefix_select('all', 'any', 1);

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Please help me to change that 'all' to a list of prefix ids, if there are totally 10 prefixes ids, how to filter only by 4 selected prefixes ? (if i have 10 prefixes, how to show only 4 prefixes in the search option?)
Here is the execution code:

Code:

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<select name="threadprefix" multiple="multiple" size="5"> <option value="any" selected="selected">Find threads with any prefix</option> <option value="0">No prefix</option> <option value="7">Red</option> <option value="8">Blue</option> <option value="10">Green</option> </select>

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Thanks for attention