ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

if(ie4)
{
    document.write('<LINK REL="STYLESHEET" TYPE="TEXT/CSS" HREF= "css/general.css" >')
    document.write('<LINK REL="STYLESHEET" TYPE="TEXT/CSS" HREF= "css/explo.css" >')
}
else
{
	document.write('<LINK REL="STYLESHEET" TYPE="TEXT/CSS" HREF="css/general.css" >')
    document.write('<LINK REL="STYLESHEET" TYPE="TEXT/CSS" HREF="css/nets.css" >')
}