replace .copy-paste with on page load?

I was wondering if anyone might know how to change this code so the copy-paste function is changed to a function that just pastes when the page loads, without the click?

In functions.php

function imath_copy_paste(){
		{	?>
		<script type="text/javascript">
			jQuery('.copy-paste').click(function(){
				var shortcode = jQuery(this).find(":first").val();
				jQuery("#content-text-ta").val(jQuery("#content-text-ta").val()+shortcode);
			});
		</script>

In a custom page template:

<div class="copy-paste">
	<input type="hidden" id="copy-paste-shortcode" value="[xilipostinpost query='name=<?php echo $post->post_name;?>']&nbsp;"	<a href="javascript:void(0)" title="click here to add this contnent to the entry form on the right.">add this entry to my trip!</a>
</div>

I don’t really know Java, hoping it’s a simple adjustment.

thanks!