function isEmpty(word){
  var i;
  for(i = 0;i<word.length;i++)
    if (word.charAt(i)!=" ") return false;
  return true;
}

function addmember_valid(form) { 
  var nonempty = new Array('T1','Address','Telephone','Email','txt_name');
  var ntext = new Array('Current Membership number','Address','Telephone number','Email id','Full Name');
  var i;
  for(i=0;i< nonempty.length;i++){ 
    var str="";
    eval('str = form.' + nonempty[i] + '.value');
    if(isEmpty(str)){ 
      alert('Please enter the ' + ntext[i]);
      return false;
    } 
  }
  return true;
}