function LimparCampo(_campo)
{
    $(_campo).value = '';
}

function float2moeda(num) {
               x = 0;

               if(num<0) {
                  num = Math.abs(num);
                  x = 1;
               }   if(isNaN(num)) num = "0";
                  cents = Math.floor((num*100+0.5)%100);

               num = Math.floor((num*100+0.5)/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));   ret = num + ',' + cents;   if (x == 1) ret = ' - ' + ret;return ret;
            }

function $(that)
            { 
                return document.getElementById(that);
            }