<input id="image_height" value="300" maxlength="4" size="4" type="number"
onchange="checkISValue(this, 'dim'); recalcCoord('Cr', 'scale');">
<input type="checkbox" id="proportional" checked="true"
onchange="checkProportions();">
<label for="proportional">proportional</label>
<input id="image_height" value="300" maxlength="4" size="4" type="number"
onchange="checkISValue(this, 'dim'); recalcCoord('Cr', 'scale');">
<input type="checkbox" id="proportional" checked="true"
onchange="checkProportions();">
<label for="proportional">proportional</label>