it's work only once. at second button click, occured nothing.

if I change budilnik variable at i_budilnik or var budilnik, occured nothing at first and other clicks!

Where is the problem?

<div><form name="alert"><input type="text" name="hour" /><input type="text" name="min"/><input type="button" value="ok" onclick="budilnik(this.form)"></form><font color=#660000 size=20 face=Tahoma><span id="hours"></span>
</div>

<script type="text/javascript">


function budilnik(form)
{
    budilnik=1;
    min=form.min.value;
    hour=form.hour.value;
}

obj_hours=document.getElementById("hours");

function wr_hours()
{
time=new Date();

time_min=time.getMinutes();
time_hours=time.getHours();
time_wr=((time_hours<10)?"0":"")+time_hours;
time_wr+=":";
time_wr+=((time_min<10)?"0":"")+time_min;


time_wr=time_wr;

obj_hours.innerHTML=time_wr;



if (i_budilnik==1) {

 if (min==time_min) 
     {
          if (hour==time_hours)
           {
              alert('welldone');
              budilnik=0;
           }
        }

     } 
}
wr_hours();
setInterval("wr_hours();",1000);
</script>