To include more than one lightbox on a page, only call the script in the first code. This accommodates IE which downloads the file the first time it is called:

<script src="http://www.jotform.com/min/g=feedback" type="text/javascript">
new JotformFeedback({
formId:'xxxxxxxxx1',
base:'http://www.jotform.com/',
windowTitle:'Some title here',
background:'#90BD2E',
fontColor:'#FFFFFF',
type:1,
height:800,
width:650
});
</script>

<script type="text/javascript">
new JotformFeedback({
formId:'xxxxxxxxx2',
base:'http://www.jotform.com/',
windowTitle:'Some title here for 2nd form',
background:'#90BD2E',
fontColor:'#FFFFFF',
type:1,
height:800,
width:650
});
</script>

<script type="text/javascript">
new JotformFeedback({
formId:'xxxxxxxxx3',
base:'http://www.jotform.com/',
windowTitle:'Some title here for 3nd form',
background:'#90BD2E',
fontColor:'#FFFFFF',
type:1,
height:800,
width:650
});
</script>

<script type="text/javascript">
new JotformFeedback({
formId:'xxxxxxxxx4',
base:'http://www.jotform.com/',
windowTitle:'Some title here for 4th form',
background:'#90BD2E',
fontColor:'#FFFFFF',
type:1,
height:800,
width:650
});
</script>