<input type="hidden" name="xstart" id="x1" />
<input type="hidden" name="ystart" id="y1" />
<input type="hidden" name="xfinal" id="x2" />
<input type="hidden" name="xstart" id="x1" />
<input type="hidden" name="ystart" id="y1" />
<input type="hidden" name="xfinal" id="x2" />