To pass to another form:
[code=javascript]//get the textbox
var txtbox = document.getEle mentById("txtBo xID");
// get the checkbox value
var chkbox = document.getEle mentById("chkbo xID");
var val = chkbox.checked // or possibly value depending on what the OP meant
// set textbox
txtbox.value = val;[/code]
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