If i press submit button that is entering to other url in sevlet

If i press submit button that is entering to other url in sevlet

This is my javascript code what is happening in when i press the submit
button second time it is going to the other url but in the first time it
is giving the result fine can anyone help me plz
function validatenewcat(){
var category = document.getElementById("cat").value;
if(category==""){
setTimeout(document.getElementById("validate").innerHTML="!PLz
Enter The Category Name", 2000);
return false;
}
else{
var url="catnamecheck.do?id="+category;
xmlhttp.open("post", url,true);
xmlhttp.send(null);
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState==4){
if(xmlhttp.status==200){
var temp = xmlhttp.responseText;
obj = JSON.parse(temp);
if(obj.catgoryname==category) {
alert(obj.catgoryname);
alert(category);
document.getElementById("validate").innerHTML="!PLz
Enter The Unique Category Name";
return false;
}
if(obj.catgoryname!=category){
alert("inside true"+obj.catgoryname);
alert("inside true"+category);
return true;
}
}
}
}
}
}
This is my java code i'm calling this code from ajax
public Map<String, String> catuniqecheck(String id) {
Connection c = null;
PreparedStatement ps1 = null;
ResultSet rs1 = null;
String sql=null;
try{
c = JDBCHelper.getConnection();
if(c!=null)
{
Map<String, String> map = new HashMap<String, String>();
sql="select * from catgory where catgoryname=?";
ps1=c.prepareStatement(sql);
ps1.setString(1, id);
ps1.execute();
rs1=ps1.getResultSet();
if(rs1.next())
{
System.out.println("insdide of the catuniqecheck");
map.put("catgoryname",rs1.getString("catgoryname"));
}
return map;
}
else
{
System.out.println("DB connection Established");
return null ;
}
}
catch (Exception e) {
// TODO: handle exception
return null ;
}
finally{
JDBCHelper.close(rs1);
JDBCHelper.close(ps1);
JDBCHelper.close(c);
}
}
This is my sevlet code
if (uri.contains("/catnamecheck.do")) {
Project p1=new Project();
String id=request.getParameter("id");
System.out.println("inside uniq check id"+id);
Map<String, String> result =p1.catuniqecheck(id);
if(result!=null)
{
System.out.println("inside success");
JSONObject json = new JSONObject();
json.accumulateAll(result);
System.out.println("inside json"+json.toString());
response.setContentType("application/json");
response.getWriter().write(json.toString());
}
if(result==null)
{
System.out.println("inside filure");
}
}
This is my jsp code
<form name="frm" action="createnewcatgoryBean.jsp" onsubmit="return
validatenewcat()" method="post">
<table style="padding: 5px 0px 0px 8px;">
<tr>
<th colspan="2">
<div style="width: width:271px; color:red;" id="validate"></div>
</th>
</tr>
<tr>
<th>Category Name<span>:</span></th><td><input id="cat" onblur="return
validatenewcat()" type="text" name="category">
</td>
</tr>
<tr>
<th>Quotations form<span>:</span></th><td><input type="checkbox"
name="quotations"></td>
</tr>
<tr>
<th>Agreement form<span>:</span></th><td><input type="checkbox"
name="agreement"></td>
</tr>
<tr>
<th>Payment form<span>:</span></th><td><input type="checkbox"
name="payment"></td>
</tr>
<tr>
<th>ETI<span>:</span></th><td><input type="checkbox" name="eti"></td>
</tr>
<tr>
<td colspan="2" style="float:right; padding-top:15px">
<input type="submit" value="Submit" style="width: 60px;">
</td>
</tr>
</table>
</form>