[[HiC]TheKiller]

pawn Code:

#define RANDOM_MESSAGE_TIMER 60000  //One minute 
new messagenumber = 0;
new messages[][2] =
{
    {"Message 1", COLOR1},
    {"Message 2", COLOR2},
    {"Message 3", COLOR3},
};

public OnGameModeInit()
{
    SetTimer("SendMessages", RANDOM_MESSAGE_TIMER, true);
    return 1;
}

forward SendMessages();
public SendMessages()
{
    if(messagenumber == sizeof(messages)) messagenumber = 0;
    SendClientMessageToAll(messages[messagenumber][1], messages[messagenumber][0]);
    messagenumber ++;
    return 1;
}

Hope that helps.