var linkCSS='<link rel="stylesheet" type="text/css" href="'

if(is_win){

 if(is_nav6)document.write(linkCSS+'pc_nn6.css">')
 else if(is_ie5)document.write(linkCSS+'style.css">')
 else if(is_ie5up)document.write(linkCSS+'style.css">')
 else if(is_ie4)document.write(linkCSS+'style.css">')
 else if(is_ie3)document.write(linkCSS+'style.css">')
 else if(is_nav4up)document.write(linkCSS+'pc_nn.css">')
 else if(is_nav4)document.write(linkCSS+'pc_nn.css">')
 
}else if(is_mac){

 if(is_nav6)document.write(linkCSS+'mac_nn6.css">')
 else if(is_nav4up)document.write(linkCSS+'mac_nn.css">')
 else if(is_nav4)document.write(linkCSS+'mac_nn.css">')
 else if(is_ie5up)document.write(linkCSS+'mac_ie5.css">')
 else if(is_ie5)document.write(linkCSS+'mac_ie5.css">')
 else if(is_ie4)document.write(linkCSS+'mac_ie4.css">')
 else if(is_ie3)document.write(linkCSS+'mac_ie4.css">')
}