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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>