Regexp replace

[helpmeinphp]

Hi,

I am really stuck with regexp replace.
I want to replace a string after checking it is valid by passing the values to a function.

The string is '<img width="300" height="300">'

var text = '<img width=300 height=300>';
text = text.replace(/<img width\=(.*?) height\=(.*?)>/gi, check_img($1, $2));

The $1 and $2 values are not being passed to the function.
This same method works in PHP by the e Modifier but not in JS.

Please Help.

[stereofrog]

In javascript, to execute on replace, the second parameter must be a function, e.g.

function check_img(tag, widht, height) {
    //........................
}
text = text.replace(/<img width\=(.*?) height\=(.*?)>/gi, check_img);

[helpmeinphp]

But how to pass $1 and $2 to this function.
In your example it is not passed to the function.

EDIT:
I get it now the $1...$9 are passed directly into the function parameters
Thanks guys