Jquery change my text to utf-8 when i use ISO-8859-1

Jquery change my text to utf-8 when i use ISO-8859-1

hi, im using php and mysql, all works very well, but i need to refresh just a part of the file post.php, i decide to use jquery, it works great, i have another file comentarios.php, in post.php i have a div, i use the load option to load comentarios.php into post.php in the div "comments". by itselft comentarios.php doesnt have any problem, also post.php, both use ISO-8859-1, but when i load the file by jquery though the div using "load" i see some symbols, if i set my files to utf-8 this problem is gone, but, i need to use ISO-8859-1, i cant change to utf-8, is there an option in jquery to set by default ISO-8859-1?

thanks.


my code to load:
var id_post="<? echo $post_to_show; ?>";
$("#comentarios").load("comentarios.php?id_post="+id_post).fadeIn("slow");

im using jquery-1.4.2.js