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40 aurelien 1 
<!DOCTYPE html>
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<html lang="en">
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<head>
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	<meta charset="utf-8">
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	<title>jQuery UI Position - Default functionality</title>
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	<link rel="stylesheet" href="../../themes/base/jquery.ui.all.css">
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	<script src="../../jquery-1.4.2.js"></script>
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	<script src="../../ui/jquery.ui.core.js"></script>
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	<script src="../../ui/jquery.ui.widget.js"></script>
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	<script src="../../ui/jquery.ui.position.js"></script>
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	<link rel="stylesheet" href="../demos.css">
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    <style>
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   	html, body {
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   		margin: 0;
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		padding: 0
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   	}
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    </style>
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	<script>
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	$(function() {
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		$.fn.position2 = function( options ) {
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			return this.position( $.extend({
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				of: window,
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				using: function( to ) {
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					$( this ).css({
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						top: to.top,
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						left: to.left
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					})
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				},
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				collision: "none"
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			}, options));
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		}
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		$.fn.left = function( using ) {
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			return this.position2({
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				my: "right middle",
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				at: "left middle",
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				offset: "25 0",
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				using: using
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			});
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		}
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		$.fn.right = function( using ) {
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			return this.position2({
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				my: "left middle",
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				at: "right middle",
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				offset: "-25 0",
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				using: using
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			});
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		}
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		$.fn.center = function( using ) {
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			return this.position2({
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				my: "center middle",
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				at: "center middle",
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				using: using
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			});
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		};
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		$( "img:eq(0)" ).left();
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		$( "img:eq(1)" ).center();
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		$( "img:eq(2)" ).right();
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		$( "body" ).css({
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			overflow: "hidden"
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		})
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		$( ".demo" ).css({
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			position: "relative",
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		});
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		$( ".demo img" ).css({
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			position: "absolute",
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		});
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		function animate( to ) {
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			$(this).animate( to );
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		}
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		function next() {
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			$( "img:eq(2)" ).center( animate );
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			$( "img:eq(1)" ).left( animate )
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			$( "img:eq(0)" ).right().appendTo( ".demo" );
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		}
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		function previous() {
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			$( "img:eq(0)" ).center( animate );
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			$( "img:eq(1)" ).right( animate );
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			$( "img:eq(2)" ).left().prependTo( ".demo" );
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		}
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		$( "#previous" ).click( previous );
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		$( "#next" ).click( next );
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		$( ".demo img" ).click(function() {
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			$( ".demo img" ).index( this ) === 0 ? previous() : next();
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		});
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		$( window ).resize(function() {
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			$( "img:eq(0)" ).left( animate );
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			$( "img:eq(1)" ).center( animate );
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			$( "img:eq(2)" ).right( animate );
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		});
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	});
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	</script>
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</head>
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<body>
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<div class="demo">
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<img src="images/earth.jpg" />
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<img src="images/flight.jpg" />
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<img src="images/rocket.jpg" />
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<a id="previous" href="#">Previous</a>
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<a id="next" href="#">Next</a>
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</div><!-- End demo -->
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<div class="demo-description">
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<p>A prototype for the <a href="http://wiki.jqueryui.com/Photoviewer">Photoviewer</a> using Position to place images at the center, left and right and cycle them.
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<br/>Use the links at the top to cycle, or click on the images on the left and right.
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<br/>Note how the images are repositioned when resizing the window.
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<br/>Warning: Doesn't currently work inside the demo viewer; open in a new window instead!</p>
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</div><!-- End demo-description -->
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</body>
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</html>