function changebgfile() {bgfile = parent.frames[0].document.holder.TOOLbackground.value;
	                     document.body.background=('http://www.evans2chemweb.co.uk/'+bgfile);	

                        if (parent.frames[0].document.holder.TOOLschoolname.value=="Guest Access") 
                                { howmanypagesvisited = parseInt(parent.frames[0].document.holder.linkcounter.value);
                                if (howmanypagesvisited >= 5) {
                                    endguest()
                                    } else {
                                howmanypagesvisited = parseInt(howmanypagesvisited) + 1;
                                parent.frames[0].document.holder.linkcounter.value = parseInt(howmanypagesvisited);
                                if (parseInt(howmanypagesvisited) == 1) {alert ("As a guest, you will have access to 5 pages at a time")}
				}

                         }
function endguest() {alert("Thank you for taking the time to evaluate this site.\nIf you would like to see more, either login as a guest again or register with us.");
                     parent.top.window.location.href="http://www.evans2chemweb.co.uk"}
                        
                        }