function svstr()
{
if (document.getElementById('view_pdu'))
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   document.getElementById('view_pdu').innerHTML='没有相关记录!';
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}

function cvstr()
{
if (document.getElementById('cview_pdu'))
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   else
   {
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   }
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}
view=setInterval("svstr()",3000);
view=setInterval("cvstr()",3000);