preview fetching

search.js

FST_PreviewRequests = [];

function FST_RegisterDocPreviewFetch(a) {
    ULShpi: ;
    FST_PreviewRequests.push(a)
}
var gTotReq = 0,
    gTotReqSent = 0;

function FST_StartDocPreviewFetch(b, c) {
    ULShpi: ;
    gTotReq = c;
    for (var a = 0; a < b; a++) FST_DocPreviewFetch()
}
function FST_DocPreviewFetch() {
    ULShpi: ;
    if (FST_PreviewRequests.length > 0 && gTotReqSent < gTotReq) {
        FST_PreviewRequests.shift().invoke();
        gTotReqSent++
    }
}