form.js

function validateform() {

  if (document.myform.Name.value=="") {
    alert("Name must be filled out");
    return false;
  }

  if (document.myform.College.value== "") {
              alert( "Please provide your College name!" );
              return false;
  }

  var emailID = document.myform.email.value;
  atpos = emailID.indexOf("@");
  dotpos = emailID.lastIndexOf(".");

  if (atpos < 1 || ( dotpos - atpos < 2 )) {
   alert("Please enter valid email ID")
   return false;
  }

  if(document.myform.Pwd.value < 8) {
  alert("Password must have atleast 7 characters");
  return false;
  }

return(true);
}

function clickbutton() {

  if(validateform()==false) {
  document.getElementById("button1").innerHTML="Ooops!!";
  }

  else {
  document.getElementById("button1").innerHTML="Done";
  }
  
}