string gsRndSeed = "asdf";

list glTest = [1,2,3,4,5];
integer giCount = 0;

integer RndInt(integer iMax)
// Zero to iMax returned.
// The gsRndSeed is used.
// An initial value (of anything) can be set as the initial seed.
// This gsRndSeed can be reset to produce the same set of random numbers again.
{
    gsRndSeed = llSHA1String(gsRndSeed);
    integer i = (integer)("0x" + llGetSubString(gsRndSeed, 0, 7)) & 0x7fffffff;
    return i % (iMax + 1);
}

list RandomizeList(list lInput)
// This uses the RndInt function for randomizing.
// Set gsRndSeed before coming in if you want to control the initial seed.
// This uses swapping, so there's no guarantee that it will be the fastest method.
{
    integer i;
    integer j;
    list l;
    integer iEnd = llGetListLength(lInput) - 1;
    //
    for (i = 0; i <= iEnd; i++)
    {
        j = RndInt(iEnd);
        l = llList2List(lInput, i, i);
        lInput = llDeleteSubList(lInput, i, i);
        lInput = llListInsertList(lInput, l, j);
    }
    return lInput;
}

default
{
    touch_start(integer total_number)
    {
        giCount++;
        if (giCount == 3)
        {
            giCount = 0;
            gsRndSeed = "asdf";
            glTest = [1,2,3,4,5];
            llOwnerSay("Starting over");
        }

        glTest = RandomizeList(glTest);
        llOwnerSay((string)glTest);
    }
}