//  var   hwid=(screen.width-850)/2;   
//  var   hhei=screen.height/2-250;   
  document.write('<div id="Layer_Loading"  style="LEFT:   -30px;   WIDTH:   0px;   POSITION:   absolute;   TOP:   40px;   HEIGHT:   0px">');   
  document.write('<table  height="50"   cellSpacing="0"   cellPadding="0"   width="220"   align="center"   border="0"><tr><td   align="center"><IMG  src="loading.gif"  align="middle"></td></tr></table></div>');