function checkmoney(field)
{
aval=field.value
tester=/[^\.0-9]/
if (tester.test(aval))
     {
     alert("Invalid value, please enter numbers only!")
     field.focus()
     return 0
     }
else if (aval.indexOf(".")!=-1)
     if (aval.indexOf(".")!=aval.length-3 | aval.lastIndexOf(".")!=aval.length-3)
          {
          alert("Invalid value, please enter numbers only!")
          field.focus()
          return 0
          }
          else return 1
}

function formatCurrency(num)
{
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
 num = "0";
 sign = (num == (num = Math.abs(num)));
 num = Math.floor(num*100+0.50000000001);
 cents = num%100;
 num = Math.floor(num/100).toString();
 if(cents<10)
 cents = "0" + cents;
 for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
 num = num.substring(0,num.length-(4*i+3))+','+
 num.substring(num.length-(4*i+3));
 return (((sign)?'':'-') + '$' + num + '.' + cents);
}