jQuery show background image only on startpage -

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how can display fullscreen, resizing background image startpage. have div in background stretches on full background, resizing on window.load. how can hide div unless current page startpage?

css:

.pagebg {    display: none;    position: absolute;    // set background , other properties }

html:

<body> <div class="pagebg"> </div> <div> page content </div>

javascript:

$(function() {    if(isstartpage()) {       $(".pagebg").show();    } });

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