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<script>
  jQuery(document).ready(function($){	
  	var wh = $( window ).height();
	if( wh < 768 ){
		$('#page_block_below_fold').css({'height': 768});
      	$('#page_block_below_fold').css({'height': 768});
	}else{
		$('#page_block_below_fold .border-holder').css({'height': wh});
      	$('#page_block_below_fold .border-holder').css({'height': wh});
	}
});
// end the .ready  
</script>