var i, p;

function next(src){

    var hide = "p" + src.id;                                             // previous page
    var show = "p" + (parseInt(src.id) +1);                       // next page

    for ( i=1 ; i<=pages ; i++ ){
         p = "p"+i;
         if ( p == hide || p !=show){                                    // hide previous page and all that's not the next
             document.all[p].style.display="none";
         }
         else{
             document.all[show].style.display="block";       // show next page 
        }
    }	
}

function previous(src){
    var hide = "p" + src.id;                                             // previous page
    var show = "p" + (parseInt(src.id) -1);                       // previous page

    for ( i=1 ; i<=pages ; i++ ){
         p = "p"+i;
         if ( p == hide || p !=show){                                    // hide previous page and all that's not the next
             document.all[p].style.display="none";
         }
         else{
             document.all[show].style.display="block";       // show next page 
        }
    }	

}

function OpenPage1(){
    document.all["p1"].style.display="block";	    
    for ( i=2 ; i<=pages ; i++ ){
         document.all["p"+i].style.display="none";
     }
}