Web application- java script

Hi ,

Iam trying to create web application to update a field password in custom schema. I created a custom schema userProfile and inserted data. I need to update the field password. For that a web form is created to enter email and new password.

Based on email entered by customer new password will be updated in schema. For that Iam using below javascript 

var temp= ctx.vars.emailID;
var tempPassword= ctx.vars.password;
var query = xtk.queryDef.create(
<queryDef schema= "cus:UserProfile" operation="select">
<select>
<node expr="@firstName"/>
<node expr="@lastName"/>
<node expr="@email"/>
<node expr="@password"/>
</select>
<where>
<condition expr="@email = temp"/>

</where>
</queryDef>)

var results = query.ExecuteQuery();

xtk.session.Write(<recipient xtkschema="cus:UserProfile" _operation="update" password ={tempPassword} _key="@email"/>);

Iam unable to update the field inschema.

Please help me here.