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<script>
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function chg(id,chk){
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var el = document.getElementById(id);
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var ch = document.getElementById(chk);
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if (el.src.indexOf("1.jpg")>0){
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el.src="2.jpg"
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ch.checked="true";
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// }else{
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el.src="1.jpg"
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ch.checked="";
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}
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}
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</script>
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<img src="1.jpg" id="img_1" onClick="chg(this.id,'check')"><br>
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<input type="checkbox" name="check" id="check">