Untitled

setInterval() issue in Mozilla (Javascript function)
function invoke(f,start,interval,end){
        if(!start) start=0; //default to 0ms (start right away)
        if (arguments.length <= 2)
            setTimeout(f,start);

else{
        setTimeout(repeat,start);
        function repeat(){
        var h = setInterval(f,interval);
        //if(end)setTimeout(function(){clearInterval(h)},end);
        }
    }
    }

function f(){
    if(true)
        alert("yo");
    }


<button onclick="invoke('f,200,1000,5000')">yo</button>

<button onclick="invoke('f,200,1000,5000')">yo</button>

<button onclick="invoke(f,200,1000,5000)">yo</button>