// JavaScript Document

// Validation

function emptyvalidation(entered, alertbox)

{

with (entered)

{

if (value==null || value=="")

{if (alertbox!="") {alert(alertbox);} return false;}

else {return true;}

}

} 



function emailvalidation(entered, alertbox)

{

with (entered)

{

/*apos=value.indexOf("@"); 

dotpos=value.lastIndexOf(".");

lastpos=value.length-1;

if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) 

{if (alertbox) {alert(alertbox);} return false;}

else {return true;}*/



if (!value.match("^[a-zA-Z0-9]+[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+[a-zA-Z0-9]$"))

{

	alert(alertbox);

	return false;

}

else

	return true;



}

} 



function formvalidation(thisform)

{



with (thisform)

{

if (emptyvalidation(name,"Error ! Please type in your name !")==false) {name.focus(); return false;}

if (emailvalidation(email,"Error ! Please type in your Email Address!")==false) {email.focus(); return false;}

//if (emptyvalidation(address,"Error ! Please type in your address!")==false) {address.focus(); return false;}

if (emptyvalidation(comments,"Error ! Please provide your comments !")==false) {comments.focus(); return false;}



if (emptyvalidation(code_check,"Error ! Please provide the code as in the image !")==false) {code_check.focus(); return false;}

{

	document.contact.submit();

}

}

}



<!--email validator -->

function MM_validateForm() { //v4.0

  if (document.getElementById){

    var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;

    for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args[i]);

      if (val) { nm=val.name; if ((val=val.value)!="") {

        if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');

          if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';

        } else if (test!='R') { num = parseFloat(val);

          if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';

          if (test.indexOf('inRange') != -1) { p=test.indexOf(':');

            min=test.substring(8,p); max=test.substring(p+1);

            if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';

      } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }

    } if (errors) alert('The following error(s) occurred:\n'+errors);

    document.MM_returnValue = (errors == '');

} }