<script language="javascript">
function SetText(){
document.getElementById("txtResult").innerText=document.getElementById("txtTest").value;
document.getElementById("txtResult").style.fontFamily=document.getElementById("cboFont").options[document.getElementById("cboFont").selectedIndex].value;
}
</script>
Text: <input type="text" id="txtTest" value="bla">&nbsp;
<select id="cboFont" onChange="SetText();">
<option value="Arial">Arial
<option value="Times New Roman">Times New Roman
</select><br>
<p id="txtResult" style="background-color:lightblue"></p>