java script validatin

<script type="text/javascript">
          function Validate1() {
              if (document.getElementById("<%=txtname.ClientID%>").value == "") {
            alert("Name field is mandatory");
            document.getElementById("<%=txtname.ClientID%>").focus();
            return false;
        }
        if (document.getElementById("<%=txtmobileno.ClientID%>").value == "") {
            alert("Mobile no field is mandatory");
            document.getElementById("<%=txtmobileno.ClientID%>").focus();
            return false;
        }
              if (document.getElementById("<%=txtemail.ClientID%>").value == "") {
                  alert("Email field is mandatory");
                  document.getElementById("<%=txtemail.ClientID%>").focus();
            return false;
              }
              if (document.getElementById("<%=txtqualification.ClientID%>").value == "") {
                  alert("Qualification field is mandatatory");
                  document.getElementById("<%=txtqualification.ClientID%>").focus();
            return false;
        }
           
          }
          function NumericValidation(eventObj) {
              var keycode;

              if (eventObj.keyCode) //For IE
                  keycode = eventObj.keyCode;
              else if (eventObj.Which)
                  keycode = eventObj.Which;  // For FireFox
              else
                  keycode = eventObj.charCode; // Other Browser

              if (keycode != 8) //if the key is the backspace key
              {
                  if (keycode < 48 || keycode > 57) //if not a number
                      return false; // disable key press
                  else
                      return true; // enable key press
              }
          }
    </script>