myfunction(myvalue) {
//depending on the value of the combobox
if (myvalue == ...) {
document.all.item("textboxID".style.display = '';
} else {
document.all.item("textboxID".style.display = 'none';
}
}
on the textbox add a style:
input type="text" id="textboxID" style="display:none"
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