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Is there one way to do "openPopup()" below

<input type="button" id="butt_p1" onclick="openPopup();" style="height:23px; width:97px" value="Delete" />

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only when Label "lb_t1.Text" is having a value inside?
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HuaMin ChenProblem resolverAsked:
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<input type="button" id="butt_p1" onclick="if(document.getElementById('lb_t1').innerHTML.length>0) openPopup();" style="height:23px; width:97px" value="Delete" />

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HuaMin ChenProblem resolverAuthor Commented:
Sorry, with these
        function openPopup6() {
            var lblctrl = document.getElementById("lb_pict6");
            if (lblctrl.innerHTML.length > 0) {
            return false;

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while lb_pict6.Text is having a value inside but the Panel does not come out as expected.
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