Custom PreSave Action in SharePoint List Form

1.Comment default SharePoint Save button

 <!--<SharePoint:SaveButton runat="server" ControlMode="New" id="savebutton2"/> -->

 2.Place one html input button as like following

<input type="button" value="Save & mail" name="Save" onclick="if(!PreSaveAction())return true;{ddwrt:GenFireServerEvent('__commit;__redirect={../../SitePages/Views/default.aspx}')};" />

3.Write PreSaveAction method as follows

&ltscript type="text/javascript">
function PreSaveAction(){
   Repeat Step 4 // PresaveAction we can set  default values to  sharepoint controls
  return true;
}
 &ltscrip>

4.PresaveAction we can set  default values to  sharepoint controls

    var CurrentUser= $().SPServices.SPGetCurrentUser({ fieldName: "Title", debug: false });
     $("input[title='From']").val(CurrentUser)

In the above we are getting the Current User Name and set to From field Value in the respective List