function deleinfo()

   {

  var  aa = document.getElementsByName("sel");------------------------全选的checkbox

  var bb="";

  var num=0;

  if(document.getElementById("selc").checked==true)

  {

for(var i =0;i<aa.length;i++)

{

if(aa[i].checked==true)

{

bb=bb+aa[i].value+","

}

}

cc =bb.length-1;

cc=bb.substring(0,cc);

document.write(cc);

//location.+cc;

   }

   else

   { 

    for(var i =0;i<aa.length;i++)

{

if(aa[i].checked==true)

{

bb=bb+aa[i].value+","

num++;

}

}

//alert(num);

if(num==0)

{

alert("还未勾选记录！！！");

}

else

{

cc =bb.length-1;

cc=bb.substring(0,cc);

document.write(cc);

//location.+cc;

}

   }

   }