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<canvas id="canvas" width="500" height="600"></canvas>
<script>
var canv = document.getElementById("canvas");
var ctx = canv.getContext("2d");
  function progMinus(x,y,w,h,zeit,iz){
    //x, y , w, h Eingangsgrößen für das Rechteck Progressbar
    // zeit gibt an wieviel Sekunden die Progressbar aktiv ist
   // iz Aufruf setInterval
    var ist =w;
    zeit=zeit*1000;
    var progInterval = setInterval (function() {
    ist=ist-(w/zeit)*iz;   
    ctx.fillStyle = "black";
    ctx.clearRect(x,y,w,h);   
    ctx.strokeRect(x,y,w,h);   
    ctx.fillRect(x,y,ist,h);
    if( ist<=0 ) clearInterval(progInterval);
    }, iz);
  }
 progMinus(50,50,200,10,4,10);
</script>
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<script>
function round(date, minuten) {
  var factor = minuten * 6e4;
  return new Date(Math.round(date / factor) * factor);
}
var f = this.getField("von");
f.value = util.printd("HH:MM", round(new Date(), 5));</script>
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src="https://image.jimcdn.com/app/cms/image/transf/dimension=266x367:format=jpg/path/s8649cfe614046b93/image/i8a65ed8619691a40/version/1516492863/image.jpg"
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