pointer coordinates: (x,y)
<s> <input type="button" value="800x600" onclick="document.getElementById('picture1input').setAttribute('cols',45)"/> <input type="button" value="1024x768" onclick="document.getElementById('picture1input').setAttribute('cols',58)"/> <input type="button" value="1400x1050" onclick="document.getElementById('picture1input').setAttribute('cols',81)"/> </s>