function echeck(str) {
  var at="@"
  var dot="."
  var lat=str.indexOf(at)
  var lstr=str.length
  var ldot=str.indexOf(dot)
  if (str.indexOf(at)==-1){
     alert("Invalid E-mail address")
     return false
  }
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
     alert("Invalid E-mail address")
     return false
  }
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
      alert("Invalid E-mail address")
      return false
  }
   if (str.indexOf(at,(lat+1))!=-1){
      alert("Invalid E-mail address")
      return false
   }
   if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
      alert("Invalid E-mail address")
      return false
   }
   if (str.indexOf(dot,(lat+2))==-1){
      alert("Invalid E-mail address")
      return false
   }
   if (str.indexOf(" ")!=-1){
      alert("Invalid E-mail address")
      return false
   }
   return true          
}

function ValidateForm(){
  if ((document.frmContact.txtName.value==null)||(document.frmContact.txtName.value=="")){
    alert("Please Enter your Name")
    document.frmContact.txtName.focus()
    return false
  }
  if (echeck(document.frmContact.txtEmail.value)==false){
    document.frmContact.txtEmail.value=""
    document.frmContact.txtEmail.focus()
    return false
  }
  if ((document.frmContact.txtMessage.value==null)||(document.frmContact.txtMessage.value=="")){
    alert("Please Enter your message")
    document.frmContact.txtMessage.focus()
    return false
  }
  return true
 }