Si potrebbe fare qualcosa del genere in javascript, assegnando un ID ad ogni lista e creando una classe .current a tuo piacere.
Codice PHP:
        <style type="text/css">
            
{
                
color:blue;
            }
            
a:hover  {
                
color:fuchsia
            
}
            .
current {
                
background-colororange;
            }
            
ul {
                
width:100px;
            }
        </
style>
        <
script language="Javascript">
            function 
currentSelection(id){
                if(
id=="uno"){
                
document.getElementById("uno").className "current";
                
document.getElementById("due").className "";
                } else {
                    
document.getElementById("due").className "current";
                    
document.getElementById("uno").className "";
                    }
            }
        
</script> 
Codice PHP:
        <ul>
            <
li id="uno" onclick="currentSelection('uno')">[url="#"]Pagina 1[/url]
            <
li id="due" onclick="currentSelection('due')">[url="#"]Pagina 2[/url][/list]