What Comes Round Goes Round

function RoundToPlace (decimalvalue,whatplace) {
/* written in about 30minutes by sgd@ti3.com, 27 april 1999
fixed 17 jan 2000 by sgd --parseInt properly, substr's properly
permission to reuse freely is granted. lemme know if you use it, ok? */
whatplace = parseInt(whatplace,10);  //we want this to be a numeric var
dotplace = decimalvalue.indexOf("."); 
var roundplace = dotplace + whatplace; 
if (whatplace){  // greater than zero means we want to keep decimals
    if (parseInt(decimalvalue.substr(roundplace+1,1),10)>=5) {
    /* build our decimal increment. since javascript takes 1/(10^whatplace) and blows it with FP
    arithmetic, we'll build it using strings:  1/(10^whatplace) <=> '.' + (whatplace-1)*'0' + '1' */
          zeropad = ""
          for (i=0;i<whatplace-1;i++) {zeropad +="0";}
          decimalincrement = parseFloat("."+zeropad+"1"); 
         return parseFloat(decimalvalue.substr(0,roundplace+1))+decimalincrement;
     } else { // return unincremented decimal
         return parseFloat(decimalvalue.substr(0,roundplace+1));
     } 
} else { // we want an integer, test the first decimal place
     if (parseInt(decimalvalue.substr(dotplace+1,1),10)>=5){ // return the int + 1
          return parseInt(decimalvalue.substr(0,dotplace),10)+1;
     } else { // return just the int part, unharmed
         return decimalvalue.substr(0,dotplace);
     }
}
} // end function RountToPlace