document.writeln("<div id='nogo' style='position:absolute; left:0; top:0; display:none; z-index:1;'><img src='nogo.gif' border=0></div>");

function rClickOn() 
{if (event.button==2) {
  document.all.nogo.style.left=event.x-20;
  document.all.nogo.style.top=event.y-20+document.documentElement.scrollTop;
  document.all.nogo.style.display='';
  alert('No cheating!!');
  document.all.nogo.style.display='none';
}}
document.onmousedown=rClickOn;

function check_answers()
{
var r;
var a;
r=0;

if(document.frmquiz.a1.value.toLowerCase()=='britney spears') r++;
if(document.frmquiz.a2.value.toLowerCase()=='sheryl crow') r++;
if(document.frmquiz.a3.value.toLowerCase()=='mariah carey') r++;
if(document.frmquiz.a4.value.toLowerCase()=='nelly furtado') r++;

if(document.frmquiz.b1.value.toLowerCase()=='rachel stevens') r++;
if(document.frmquiz.b2.value.toLowerCase()=='shakira') r++;
if(document.frmquiz.b3.value.toLowerCase()=='holly valance') r++;
if(document.frmquiz.b4.value.toLowerCase()=='beyonce knowles') r++;

if(document.frmquiz.c1.value.toLowerCase()=='christina aguilera') r++;
if(document.frmquiz.c2.value.toLowerCase()=='ashlee simpson') r++;
if(document.frmquiz.c3.value.toLowerCase()=='kylie minogue') r++;
if(document.frmquiz.c4.value.toLowerCase()=='sarah harding') r++;

if(document.frmquiz.d1.value.toLowerCase()=='madonna') r++;
if(document.frmquiz.d2.value.toLowerCase()=='dido') r++;
if(document.frmquiz.d3.value.toLowerCase()=='sophie ellis bextor') r++;
if(document.frmquiz.d4.value.toLowerCase()=='gwen stefani') r++;



// Take different action depending how many answers were right:
switch(r)
 {
 case 0:
  alert('You didn\'t get any right!');
  break;

 case 16:
  alert('WELL DONE!\nALL ANSWERS CORRECT !\n\n...try another quiz?');
  break;

 default:
  alert('You got '+r+' out of 16.');
  break;
 }
}