function validateEmail(){ var email_add=window.prompt("What is your e-mail address?",""); if (email_add.indexOf("@") == -1) { window.alert("You need an '@' symbol in your address, please try again."); }
if (email_add.indexOf(".") == -1){ window.alert("You need a '.' symbol in your address, please try again."); }
if ( (email_add.indexOf("@") != -1) && (email_add.indexOf(".") != -1) ){ window.alert("Thanks!"); } } //--> </SCRIPT> </HEAD> <BODY> <FORM> <INPUT type="button" value="Click to enter an e-mail address" onClick="validateEmail();"> </BODY>
</HTML>
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