var i=1;
function checkData()  {
  var re1 = /^([\w\-\_]+\.)*[\w\-\_]+@([\w-]+\.)+[A-Za-z]{2,4}$/i;
  var re2 = /^[\d\-\ \.]+$/i;
  var err=0;

document.getElementById('error0').style.visibility = "collapse"; 
document.getElementById('error1').style.visibility = "collapse";
document.getElementById('error2').style.visibility = "collapse";
document.getElementById('error3').style.visibility = "collapse";
document.getElementById('error4').style.visibility = "collapse";
document.getElementById('error5').style.visibility = "collapse";
 
 if (document.form1.tselect.value == "") {
      		document.getElementById('error1').style.visibility = "visible";
		err=1;		
  }

  if (document.form1.tname.value == "") {
   		document.getElementById('error2').style.visibility = "visible";
		err=1;		
  }
  if (document.form1.tlast.value == "") {        
		document.getElementById('error3').style.visibility = "visible";
		err=1;		
  }
  
   if (document.form1.temail.value == "") {        
		document.getElementById('error4').style.visibility = "visible";
		err=1;		
  }
  
  if (!re1.test(document.form1.temail.value) && document.form1.temail.value != "") {         
		document.getElementById('error4').style.visibility = "visible";
		err=1;
  }
   if (document.form1.tcode.value == "") {
      		document.getElementById('error5').style.visibility = "visible";
		err=1;		
  }
  if(err==1) {
	 document.getElementById('error0').style.visibility = "visible";
	 return false
  }
  return true;
}


function SetBook(n){
	if (document.getElementById('ch'+n).checked) {document.getElementById('book'+n).disabled = false;document.getElementById('years'+n).disabled = false;}
	else {document.getElementById('book'+n).disabled = true; document.getElementById('years'+n).disabled = true;}
}

function showCaptchaError() {
	document.getElementById('error5').style.visibility = "visible";
	document.getElementById('error0').style.visibility = "visible";
}