Unable to call javascript function from external.js file -

Unable to call javascript function from external.js file -

i unable phone call javascript function named clear takes string parameter parameter value im passing calling function on client click. here code please help me in

<script type="text/javascript"> var _whichform = 'login' function clear(_whichform) { switch (_whichform) { case 'login': document.getelementbyid('<%=tbxusername.clientid%>').value = '' document.getelementbyid('<%=tbxpassword.clientid%>').value = '' document.getelementbyid('<%=tbxfname.clientid%>').value = '' document.getelementbyid('<%=tbxlname.clientid%>').value = '' break; break; case 'company': document.getelementbyid('<%=tbxcompname.clientid%>').value = '' document.getelementbyid('<%=tbxdescptn.clientid%>').value = '' document.getelementbyid('<%=tbxcompanyemail.clientid%>').value = '' document.getelementbyid('<%=tbxstateco.clientid%>').value = '' document.getelementbyid('<%=tbxstateco.clientid%>').value = '' document.getelementbyid('<%=tbxcity.clientid%>').value = '' document.getelementbyid('<%=tbxcompanyaddress.clientid%>').value = '' document.getelementbyid('<%=tbxcpcountrycode.clientid%>').value = '' document.getelementbyid('<%=tbxcpstatecode.clientid%>').value = '' document.getelementbyid('<%=tbxphone.clientid%>').value = '' document.getelementbyid('<%=tbxcfcountrycode.clientid%>').value = '' document.getelementbyid('<%=tbxcfstatecode.clientid%>').value = '' document.getelementbyid('<%=tbxcffax.clientid%>').value = '' break; } } </script> <input id="btnlogincancel" type="button" value="clear" onclick="clear('login')" class="buttons"/>

you missed semicolon.

var _whichform = 'login';

javascript