problem of javascript on returning false

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Javascript

<script language="javascript" type="text/javascript">
      function JobDetailsValidation()
      {
      debugger;
      var Position=document.getElementById("txtPosition").value;
      var KeySkills=document.getElementById("txtKeySkills").value;
      var JobDescription=document.getElementById("txtJobDiscription").value;
      var JobLocation=document.getElementById("txtJobLocation").value;
      if(Position==null||Position==""||KeySkills==null||KeySkills==""||JobDescription==null||JobDescription==""||JobDescription==null||JobDescription==""||JobLocation==null||JobLocation=="")
     {
       alert("Job Details name must be filled out");
       return false;
     }
     else 
          {
            ExperienceValidation()
          }
      }
      function ExperienceValidation()
      {
      var Experience=document.getElementById("DropDownList1").value;
      var Experience1=document.getElementById("DropDownList2").value;
      var CTC=document.getElementById("DropDownList3").value;
      var Level=document.getElementById("DropDownList4").value;
      var Gender=document.getElementById("DropDownList5").value;
      if(Experience==null||Experience==""||Experience1==null||Experience1==""||CTC==null||CTC==""||Level==null||Level==""||Gender==null||Gender=="")
          {
             alert("Please Select All Details Of Experience Section");
             return false;
          } 
     return false;
      }
      </script>

I uses this code in javascript,but my problem is when the function ExperienceValidation() run and when it returns false the request is still going on the server side.Please help me and thanks in advance