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Try:
<SCRIPT LANGUAGE="JavaScript"><!--
function replace(string,text,by) {
// Replaces text with by in string
var strLength = string.length, txtLength = text.length;
if ((strLength == 0) || (txtLength == 0)) return string;
var i = string.indexOf(text);
if ((!i) && (text != string.substring(0,txtLength))) return string;
if (i == -1) return string;
var newstr = string.substring(0,i) + by;
if (i+txtLength < strLength)
newstr += replace(string.substring(i+txtLength,strLength),text,by);
return newstr;
}
document.write(replace('XXXX','X','Y') + '<BR>');}
//--></SCRIPT>
<FORM NAME="myForm">
<TEXTAREA COLS="10" NAME="myText" ROWS="3"></TEXTAREA>
<SELECT NAME="mySelect" onChange="document.myForm.myText.value=replace(document.myForm.mySelect.options[document.myForm.mySelect.selectedIndex].value,'\\r\\n','\r\n')">
<OPTION>Select:
<OPTION VALUE="Check\r\nthis\r\nout">Select me!
</SELECT>
</FORM>