two Jquery plugin not working on same page

I have to use 2 jquery plug in in same page but only one plug in is working at a time
Here is my script code
<script type="text/javascript" >
$(document).ready( function()
{
$('pre.loadme').lazyLoad();
$('pre.morestuff').lazyLoad();
} );
</script>

<script>
$(document).ready(function(){

// hide #back-top first
$("#back-top").hide();

// fade in #back-top
$(function () {
$(window).scroll(function () {
if ($(this).scrollTop() > 100) {
$('#back-top').fadeIn();
} else {
$('#back-top').fadeOut();
}
});

// scroll body to 0px on click
$('#back-top a').click(function () {
$('body,html').animate({
scrollTop: 0
}, 800);
return false;
});
});

});
</script>

[Resolved]