function queryChange()	{	var n, i, m;	var ob1, ob2;	ob1 = document.query.selecttype;	ob2 = document.query.cate;	ob3 = document.query.class1;	m = ob1.selectedIndex;	n = ob2.length;	p = ob3.length;	for(i = n - 1; i >= 0; i--)	ob2.options[i] = null;    for(i = p - 1; i >= 0; i--)	ob3.options[i] = null;	if (m==0)	{		NewOptionName = new Option("不限定条件","null");		ob2.options[0] = NewOptionName;		NewOptionName = new Option("歌曲下载","11");		ob2.options[1] = NewOptionName;		NewOptionName = new Option("不限定条件","1");		ob3.options[0] = NewOptionName;		NewOptionName = new Option("歌手","0");		ob3.options[1] = NewOptionName;		} else	{		NewOptionName = new Option("不限定条件","null");		ob2.options[0] = NewOptionName;		NewOptionName = new Option("不限定条件","null");		ob3.options[0] = NewOptionName;	}	ob2.options[0].selected = true;	ob3.options[0].selected = true;}document.write("<form name=\"query\" method=\"post\" action=\"query.php\">");
document.write("<img src='images/search.gif'>&nbsp;<b>歌曲搜索：</b>&nbsp;&nbsp;<select name=\"selecttype\"  onChange=\"Javascript:queryChange();\" style=\"HEIGHT: 18px;"); document.write("WIDTH:60px;background-color:#EFF7FF;border-style:solid;border-color:#000000;border-width:1px\">"); 
document.write("                  <option value=\"2\" selected>专辑</option>");
document.write("                  <option value=\"3\">歌曲</option>");
document.write("                </select>");
document.write("     &nbsp;<select name=\"class1\" style=\"HEIGHT: 18px; WIDTH: 120px;background-color:#EFF7FF;border-style:solid;border-color:#000000;border-width:1px\">");
document.write("                  <option value=\"all\" selected>不限定条件</option>");
 		
document.write(" 			  <option value=\"0\">歌手</option>");
                 
 document.write("                </select>");
document.write("&nbsp;<input type=\"text\" name=\"queryStr\" size=\"20\" value=\"输入想查询的关键字\"   onFocus=\"this.select()\" onMouseOver=\"this.focus()\"  class=whois_box>");
document.write("&nbsp;&nbsp;<input type=\"submit\" name=\"query\" value=\"搜索\" class=botton>");
document.write("</form>");