function scr_retarget(arg0)
{
    thistarget = global.chartarget[arg0];
    cancelattack = 0;
    if (thistarget == 0)
    {
        if (global.monster[0] == 0)
            thistarget = 1;
    }
    if (thistarget == 1)
    {
        if (global.monster[1] == 0)
            thistarget = 2;
    }
    if (thistarget == 2)
    {
        if (global.monster[2] == 0)
            thistarget = 3;
        if (thistarget == 3 && global.monster[0] == 1)
            thistarget = 0;
        if (thistarget == 3 && global.monster[1] == 1)
            thistarget = 1;
        if (thistarget == 3)
            cancelattack = 1;
    }
    global.chartarget[arg0] = thistarget;
}