I have this piece of code that imports a font for my navigation and overrides my original default font, I want this font style to stop and revert back to the original default font when the screen goes down to 768px wide.

Every time I try to control this it just defaults to my changes from the off, the control needs to be in this file because of the way this site is set up.

The code of the page is below. No doubt you will need some more information, just let me know what you need and I'll try to supply it.

<code>
<?php

function fu_output_css() {

echo '<style type="text/css" media="screen">';
if (get_option('fu_header_font') != 'Choose a font' && get_option('fu_header_font') != null)
{ echo '
@font-face {
font-family: "header-font";
src: url("'; echo fu_get_font_url( get_option('fu_header_font') ); echo '");
}';
}
if (get_option('fu_body_font') != 'Choose a font' && get_option('fu_body_font') != null)
{ echo '
@font-face {
font-family: "body-font";
src: url("'; echo fu_get_font_url( get_option('fu_body_font') ); echo '");
}';
}
if (get_option('fu_lists_font') != 'Choose a font' && get_option('fu_lists_font') != null)
{ echo '
@font-face {
font-family: "lists-font";
src: url("'; echo fu_get_font_url( get_option('fu_lists_font') ); echo '");
}';
}
if (get_option('fu_custom_one_font') != 'Choose a font' && get_option('fu_custom_one') != null)
{ echo '
@font-face {
font-family: "custom-one";
src: url("'; echo fu_get_font_url( get_option('fu_custom_one_font') ); echo '");
}';
}
if (get_option('fu_custom_two_font') != 'Choose a font' && get_option('fu_custom_two') != null)
{ echo '
@font-face {
font-family: "custom-two";
src: url("'; echo fu_get_font_url( get_option('fu_custom_two_font') ); echo '");
}';
}
if (get_option('fu_custom_three_font') != 'Choose a font' && get_option('fu_custom_three') != null)
{ echo '
@font-face {
font-family: "custom-three";
src: url("'; echo fu_get_font_url( get_option('fu_custom_three_font') ); echo '");
}';
}
if (get_option('fu_custom_four_font') != 'Choose a font' && get_option('fu_custom_four') != null)
{ echo '
@font-face {
font-family: "custom-four";
src: url("'; echo fu_get_font_url( get_option('fu_custom_four_font') ); echo '");
}';
}
if (get_option('fu_custom_five_font') != 'Choose a font' && get_option('fu_custom_five') != null)
{ echo '
@font-face {
font-family: "custom-five";
src: url("'; echo fu_get_font_url( get_option('fu_custom_five_font') ); echo '");
}';
}
if (get_option('fu_header_font') != 'Choose a font' && get_option('fu_header_font') != null)
{
echo 'h1, h2, h3, h4, h5, h6, h7 {
font-family: "header-font"!important;
}';
}
if (get_option('fu_body_font') != 'Choose a font' && get_option('fu_body_font') != null)
{
echo 'p, em, div {
font-family: "body-font"!important;
}';
}
if (get_option('fu_lists_font') != 'Choose a font' && get_option('fu_lists_font') != null)
{
echo '
li {
font-family: "lists-font"!important;
}';
}

if (get_option('fu_custom_one_font') != 'Choose a font' && get_option('fu_custom_one') != null)
{
echo get_option('fu_custom_one'); echo ' {
font-family: "custom-one"!important;
}';
}
if (get_option('fu_custom_two_font') != 'Choose a font' && get_option('fu_custom_two') != null)
{
echo get_option('fu_custom_two'); echo ' {
font-family: "custom-two"!important;
}';
}
if (get_option('fu_custom_three_font') != 'Choose a font' && get_option('fu_custom_three') != null)
{
echo get_option('fu_custom_three'); echo ' {
font-family: "custom-three"!important;
}';
}
if (get_option('fu_custom_four_font') != 'Choose a font' && get_option('fu_custom_four') != null)
{
echo get_option('fu_custom_four'); echo ' {
font-family: "custom-four"!important;
}';
}
if (get_option('fu_custom_five_font') != 'Choose a font' && get_option('fu_custom_five') != null)
{
echo get_option('fu_custom_five'); echo ' {
font-family: "custom-five"!important;
}';
}
echo '

</style>';

}
add_action('wp_head','fu_output_css');
</code>