inserting .js script

Im trying to insert a .js script in site. I need it to load above the mootools-core script (I would like it to be the first line) and can not figure out which file to add the line to. Any help would be appreciated.

Joomla 2.5.19
Gavick Simplicity

Current:

</style>
<script src="/media/system/js/mootools-core.js" type="text/javascript"></script>
<script src="/media/system/js/core.js" type="text/javascript"></script>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js" type="text/javascript"></script>
<script src="/components/com_k2/js/k2.js?v2.6.9&amp;sitepath=/" type="text/javascript"></script>
<script src="/media/system/js/caption.js" type="text/javascript"></script>
<script src="/media/system/js/mootools-more.js" type="text/javascript"></script>
<script src="/media/system/js/modal.js" type="text/javascript"></script>
<script src="http://www.solutions-recovery.com/templates/gk_simplicity/js/gk.scripts.js" type="text/javascript"></script>
<script src="http://www.solutions-recovery.com/templates/gk_simplicity/js/gk.menu.js" type="text/javascript"></script>
<script type="text/javascript">
window.addEvent('load', function() {
new JCaption('img.caption');
});
window.addEvent('domready', function() {

SqueezeBox.initialize({});
SqueezeBox.assign($$('a.modal'), {
parse: 'rel'
});
});
$GKMenu = { height:true, width:true, duration: 250 };
$GK_TMPL_URL = "http://www.solutions-recovery.com/templates/gk_simplicity";

$GK_URL = "http://www.solutions-recovery.com/";

</script>

What I want:

</style>
<script src="/dialogtech.js" type="text/javascript"></script>
<script src="/media/system/js/mootools-core.js" type="text/javascript"></script>
<script src="/media/system/js/core.js" type="text/javascript"></script>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js" type="text/javascript"></script>
<script src="/components/com_k2/js/k2.js?v2.6.9&amp;sitepath=/" type="text/javascript"></script>
<script src="/media/system/js/caption.js" type="text/javascript"></script>
<script src="/media/system/js/mootools-more.js" type="text/javascript"></script>
<script src="/media/system/js/modal.js" type="text/javascript"></script>
<script src="http://www.solutions-recovery.com/templates/gk_simplicity/js/gk.scripts.js" type="text/javascript"></script>
<script src="http://www.solutions-recovery.com/templates/gk_simplicity/js/gk.menu.js" type="text/javascript"></script>
<script type="text/javascript">
window.addEvent('load', function() {
new JCaption('img.caption');
});
window.addEvent('domready', function() {

SqueezeBox.initialize({});
SqueezeBox.assign($$('a.modal'), {
parse: 'rel'
});
});
$GKMenu = { height:true, width:true, duration: 250 };
$GK_TMPL_URL = "http://www.solutions-recovery.com/templates/gk_simplicity";

$GK_URL = "http://www.solutions-recovery.com/";

</script>

Hi,
you have two options:
1) Edit layout/default.php from template folder
2) Use module/plugin which allows you to use custom js file or just code: https://www.gavick.com/documentation/jo ... s-php-code

Sorry, but in general we do not help in code customizations.

P.s.
Besides, Joomla 2.5.19 - are you kidding ?
you should have at least 2.5.28,

your CMS version was not updated more than year, you have been in coma?

thank you oscar.