var i=0;

function blink(){

    element = document.getElementById("promocja");
    
    if(i == 100) i=0;
        
    if(i%2 == 0)
        element.style.color = "#ff0000";
    else
        element.style.color = "#000000";
        
    setTimeout("blink(i++);",1000);
    
    return false;
}