if ( navigator.appName=="Microsoft Internet Explorer" ) { 
document.write('<SCRIPT type="text/javascript" SRC="../script/layer_top.js"></SCRIPT>') ;
}else if (navigator.appName.charAt(0)=="N"){ 
 if( document.layers ) { 
document.write('') ;
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document.write('<SCRIPT type="text/javascript" SRC="../script/layer_top.js"></SCRIPT>') ;
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document.write('<SCRIPT type="text/javascript" SRC="../script/layer_top.js"></SCRIPT>') ;
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}else if(navigator.appName.charAt(0)=="O"){ 
document.write('<SCRIPT type="text/javascript" SRC="../script/layer_top.js"></SCRIPT>') ;
}else{ 
document.write('<SCRIPT type="text/avascript" SRC="../script/layer_top.js"></SCRIPT>') ;
}