One jQuery script works, another doesn't

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hi these lines are in my header just before the i have two scripts first is script.js that uses quicksand.js and the second is plusslider. when i leave the code like this the plusslider works but the script.js doesn’t and when i delete the call for the plussslider the script.js works fine. i just cant make them work at the same time…CAN ANY ONE HELP ME PLEASE!!

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/jquery.quicksand.js"></script>
<script language="javascript" type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/script.js"></script>
<script language="javascript" type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/jquery.plusslider-min.js"></script>

<script language="javascript">
$(document).ready(function(){

$('#slider').plusSlider({
    createPagination: false,
    sliderEasing: 'easeInOutExpo',
    fullWidth: true,
    sliderType: 'slider'
    });

});

<?php wp_head(); ?>