Working with parameters in the URL from javascript

Task is to hide some page elements based on parameter in the URL.

Example URL: http://mypage.com?hidePrintButton=true

In this case we should hide print button.

Implementation (without jQuery):
<script language='JavaScript'>
window.onload = function() {
if(document.URL.indexOf('hidePrintButton=true')!==-1){
document.getElementById('printButton').style.visibility='hidden';
}
}
</script>
<button id="printButton" class="link icon iconPrint notPrintable pagePrint" title="Do print page" type="button"></button>