need help in passing URL parameters to variables

i need help with a little code that i have below. i'm a newbie in javascript so i hope someone could help me here

i've used the function below to grab parameters from URL:

<script type="text/javascript">
function gup( name )
 {
 name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
 var regexS = "[\\?&]"+name+"=([^&#]*)";
 var regex = new RegExp( regexS );
 var results = regex.exec( window.location.href );
 if( results == null )
  return "";
 else
  return results[1];
 }
</script>

now the problem is that i need to set that parameters into variable so i can use that variable into something else.

for instance i have below form:

<form method="get" action="#" name="dealer">
   insert dealer code<br />
   <input type="text" name="dcode" />
   <input type="submit开发者_开发百科" value="submit" />
</form>

so whenever i pressed submit button, URL will have parameter. i want to use this parameter as variable. here is the output code

var dealer_param = gup( 'dcode' );
document.write(dealer_param);

again for instance i have define variables:

var a1 = "John Doe"
var a2 = "Jane Doe"

now i want to type a1 in the form box and when i pressed submit i want javascript gave me John Doe as the output and not a1 as i'm currently have

i hope it's not much of a confusing question

thanks in advance

~aji

The easiest solution is to store the values in an assocuative array instead of individual variables. E.g.

var arr;
arr['a1'] = "John Doe";
arr['a2'] = "Jane Doe";

// ...

var dealer_param = gup( 'dcode' );
document.write(arr[dealer_param]);

A second approach is to use eval - which I personally would recommend against for a variety of reasons including security issues.

var a1 = "John Doe"
var a2 = "Jane Doe"

var dealer_param = gup( 'dcode' );
document.write(eval(dealer_param));