function cleartext() {
    var f=document.form1;
    if (f.friendemail.value=="Sign up for E-News") {
        f.friendemail.value='';
    }
}

function validateform() {
    var f=document.form1;
    var err=0;
	if ((f.friendemail.value == '') || (f.friendemail.value == 'Sign up for E-News')){
		f.friendemail.focus();
		alert("Please enter email address");
		err=1;
	}
    
    if (err==0) {
	    email = f.friendemail.value;
	    if(/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/.test(email) || !/^.+\@[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3})$/.test(email)) {
    		alert("Please enter correct email address");
		    f.friendemail.focus();
		    err=1;
	    }
	}

    if (err==0) {
        f.action="http://optsend.optagger.com/friend/friend_add.php";
        f.submit();
        return true;
    } else {
        return false;
    }
}

function init() {
   var html="";
   html=html + "<form name=form1 method=post action=''>";
   html=html + "<input name='friendemail' type='text' value='Sign up for E-News' onclick=\"cleartext();\"/>";
   html=html + "<input type='hidden' name='key' value='addfriend'>";
   html=html + "<input type='hidden' name='actkey' value='dQemUHv47jBNrzZ4evT0'>";
   html=html + "<input type='hidden' name='id' value='3'>";
   html=html + "<input type='hidden' name='friendcategory' value='Subscriber'>";
   html=html + "<input type='hidden' name='returnurl' value='http://www2.ghspsa.org.hk/sub_thankyou.php'>";
   html=html + "<input type='hidden' name='errorurl' value='http://www2.ghspsa.org.hk/sub_error.php'>";

   html=html + "<input type='button' name='Submit' value='Submit' onclick=\"validateform();\"/>";
   html=html + "</form>";
   document.write(html);
   //document.getElementById("optform").innerHTML=html;
   return true;
}


//if (document.all){
//   window.attachEvent('onload',displayform1());
//} else {
//    window.addEventListener('load',displayform1(),false);
//}

//window.onload=function() {
//    displayform1();
//}


// for IE
//if( document.all ){
//  init();
// for Mozilla browsers
//} else if (document.addEventListener) {
//  document.addEventListener("DOMContentLoaded", init, null);
// catch everything else
//} else {
//  window.init();
//}

init();