<input type="text" id="monInput1" value=""> <br> <input type="radio" id="R1" name="mesRadio" value="test1" onclick="setRadioValueToInpText(this.value,'monInput1')">Test1 <input type="radio" id="R2" name="mesRadio" value="test2" onclick="setRadioValueToInpText(this.value,'monInput1')">Test2 <script type="text/javascript"> function setRadioValueToInpText(radioValue,InputTextId){ document.getElementById(InputTextId).value = radioValue; } </script>