Code:
<form action="pdf1.pdf" onsubmit="for(var i = 0, e = this.elements.files; i < e.length; ++i) if(e[i].checked) window.open(e[i].value); return false;">
<label>PDF One
<input type="checkbox" name="files" value="pdf1.pdf">
</label>
<label>PDF Two
<input type="checkbox" name="files" value="pdf2.pdf">
</label>
<label>PDF Three
<input type="checkbox" name="files" value="pdf3.pdf">
</label>
<label>PDF Four
<input type="checkbox" name="files" value="pdf4.pdf">
</label>
<label>PDF Five
<input type="checkbox" name="files" value="pdf5.pdf">
</label>
<input type="submit" value="Open">
</form>
You'd be better off doing this server-side, though, or even just with normal links. Use this as a supplement to one of those two, not on its own.
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