html - how to validate form values using external javascript -


here have created 2 fields 1 first name , last name. how can access these fields in external javascript file , validate them.

<html>     <head>         <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">         <title>validation</title>     </head>     <body>         <form action="something" method="post">             firstname:<input type="text" name="fname"/>             lastname:<input type="text" name="lname"/>             <input type="submit" value="submit">         </form>     </body> </html>

i want validate both first , last name using external javascript file. how can take values external javascript file , validate. please give me suggestions.

thanks in advance.** 

<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <title>validation</title> <script type="text/javascript" src="javascript.js"></script> </head> <body> <form name="myform" action="something" onsubmit="return validateform()" method="post"> firstname:<input type="text" name="fname"/> lastname:<input type="text" name="lname"/> <input type="submit" value="submit"> </form> </body> </html>  , java script file is(save javascript.js) function validateform() {     var x=document.forms["myform"]["fname"].value;       if(x==null || x=="" )     {         alert("name can't left blank");         return false;     }      var y=document.forms["myform"]["lname"].value;     if(y==null || y=="")     {         alert("last name mandatory");         return false;     }     else     {         return true;     }  }

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