window.onload = onload;
        function showHide(subText)
        {
        var textBlock=document.getElementById(subText);
        var imgSign=document.getElementById('g'+subText);
        if(textBlock.style.display=='block')
        {
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        imgSign.src='../images/open_btn.jpg';
        imgSign.alt='click to expand'
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        else
        {
        textBlock.style.display='block';
        imgSign.src='../images/close_btn.jpg';
        imgSign.alt='click to collapse'
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