Ecco come puoi fare....

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
tot_isr = 10; 
tot_vig = 10; 
tot_bra = 10; 
tot_gre = 10; 
tot_lib = 10; 
tot_tri = 10; 
tot_mon = 1; 
tot_ita = 10; 

var arrVal = new Array();

arrVal[arrVal.length] = tot_isr ; 
arrVal[arrVal.length] = tot_vig ; 
arrVal[arrVal.length] = tot_bra ; 
arrVal[arrVal.length] = tot_gre ; 
arrVal[arrVal.length] = tot_lib ; 
arrVal[arrVal.length] = tot_tri ; 
arrVal[arrVal.length] = tot_mon ; 
arrVal[arrVal.length] = tot_ita ; 

ok = true;
for (i=0;i<arrVal.length;i++) {
 for (j=0;j<arrVal.length;j++) {
  if (arrVal[i] != arrVal[j]) {
	 ok = false;
	} // if (arrVal[i] != arrVal[j])
 } // for (j=0;j<arrVal.length;j++) 
} // for (i=0;i<arrVal.length;i++) 
alert(ok);
//-->
</script>

</body>
</html>