Message from webpage, leave or stay - html

Question

I have a php page with an HTML form that works fine in chrome and firefox, but in IE this popup shows up upon submitting the form:
It's confusing because I don't have any sort of validation on the page, so what is it that returns false?
<form name="qualityform" action="" method="post">
<input type="hidden" name="process" value="yes" />
<input type="hidden" name="ref" value="<?=$refvalue?>" />
<input type="hidden" name="email" value="<?=$emailvalue?>" />
<input type="hidden" name="interface" value="<?=$interface?>" />
<input type="hidden" name="cemail" value="<?=$cemail?>" />
<input type="hidden" name="greeting" value="<?=$greeting?>" />
<table border="0" width="100%">
<tbody>
<tr class="dq_allTravelers " id="tr_qid12" height="30">
<td width="30%"><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['over_all_Satisfaction']?>:</font></td>
<td width="10%" class="detailsRatings" onMouseOver="ta.call('ta.userreview.addDynamicRatingObject', event, this)"><label class="visuallyHidden"> <?=$language[$interface]['over_all_Satisfaction']?>
<select name="over_all_Satisfaction" id="over_all_Satisfaction">
<option value="">Select one</option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
</label>
<span id="qid12_bubbles" class="rate rate_s gs00 qid12"> <img src="<?php echo $pageURL;?>images/ratings-v7.png"> </span></td>
<td width="20%" id="AMENITY_RATING_BUBBLE_TEXT_qid12" style="color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; font-weight:bold;"></td>
</tr>
<tr class="dq_allTravelers " id="tr_qid12" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Will_you_hire']?>?</font></td>
<td><input type="radio" name="will_you_hire_us" value="Yes" /> <font style="font-size: 12px;" face="Verdana">Yes</font> <input type="radio" name="will_you_hire_us" value="No" /> <font style="font-size: 12px;" face="Verdana">No</font></td>
<td> </td>
</tr>
<tr class="dq_allTravelers " id="tr_qid12" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Will_you_recommend']?>?</font></td>
<td><input type="radio" name="will_you_recommend" value="Yes" /> <font style="font-size: 12px;" face="Verdana">Yes</font> <input type="radio" name="will_you_recommend" value="No" /> <font style="font-size: 12px;" face="Verdana">No</font></td>
<td> </td>
</tr>
<tr><td class="3">
</td></tr>
<tr class="dq_allTravelers " id="tr_qid13" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Communication']?>:</font></td>
<td class="detailsRatings" onMouseOver="ta.call('ta.userreview.addDynamicRatingObject', event, this)"><label class="visuallyHidden"> <?=$language[$interface]['Communication']?>
<select name="Communication" id="Communication">
<option value="">Select one</option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
</label>
<span id="qid13_bubbles" class="rate rate_s gs00 qid13"> <img src="<?php echo $pageURL;?>images/ratings-v7.png"> </span></td>
<td id="AMENITY_RATING_BUBBLE_TEXT_qid13" style="color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; font-weight:bold;"></td>
</tr>
<tr class="dq_allTravelers " id="tr_qid14" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Quality']?>:</font></td>
<td class="detailsRatings" onMouseOver="ta.call('ta.userreview.addDynamicRatingObject', event, this)"><label class="visuallyHidden"> <?=$language[$interface]['Quality_of_our_work']?>
<select name="Quality" id="Quality">
<option value="">Select one</option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
</label>
<span id="qid14_bubbles" class="rate rate_s gs00 qid14"> <img src="<?php echo $pageURL;?>images/ratings-v7.png"> </span></td>
<td id="AMENITY_RATING_BUBBLE_TEXT_qid14" style="color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; font-weight:bold;"></td>
</tr>
<tr class="dq_allTravelers " id="tr_qid15" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Speed_of_our_work']?>:</font></td>
<td class="detailsRatings" onMouseOver="ta.call('ta.userreview.addDynamicRatingObject', event, this)"><label class="visuallyHidden"> <?=$language[$interface]['Speed']?>
<select name="Speed" id="Speed">
<option value="">Select one</option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
</label>
<span id="qid15_bubbles" class="rate rate_s gs00 qid15"> <img src="<?php echo $pageURL;?>images/ratings-v7.png"> </span></td>
<td id="AMENITY_RATING_BUBBLE_TEXT_qid15" style="color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; font-weight:bold;"></td>
</tr>
<tr class="dq_allTravelers " id="tr_qid16" height="30">
<td><font style="font-size: 12px;" face="Verdana"><?=$language[$interface]['Value']?>:</font></td>
<td class="detailsRatings" onMouseOver="ta.call('ta.userreview.addDynamicRatingObject', event, this)"><label class="visuallyHidden"> <?=$language[$interface]['Value']?>
<select name="Value" id="Value">
<option value="">Select one</option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
</label>
<span id="qid16_bubbles" class="rate rate_s gs00 qid16"> <img src="<?php echo $pageURL;?>images/ratings-v7.png"> </span></td>
<td id="AMENITY_RATING_BUBBLE_TEXT_qid16" style="color:#000; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; font-weight:bold;"></td>
</tr>
<tr height="25">
<td valign="top"><font style="font-size:12px;" face="Verdana"><?=$language[$interface]['comment']?>:</font></td>
<td colspan="2"><textarea name="comment" class="element text medium" style="width:200px; height:100px;font-family: Lato;font-size: 13px;"></textarea></td>
</tr>
<tr><td> </td></tr>
<tr><td colspan="3">
<input type="submit" name="submit_form" value="<?=$language[$interface]['Submit']?>" class="button_text" style="font: bold 16px Lato;color: #fff;background-color: #09bef2;width: 286px;border:0;height:26px"/>
</td></tr>
</tbody>
</table>
</form>
Thanks