<input type="button" id="button1" value="button1"/>

activeSheet.pictures.add("f2","Event.png",2,2,6,6);
activeSheet.pictures.add("f1","tsoutline.png",3,0,6,6);
var picture = activeSheet.pictures.get("f2");
picture.pictureStretch(GC.Spread.Sheets.ImageLayout.center);

$("#button1").click(function () {
alert(picture.getOriginalWidth());
    });