// JavaScript Document

// puts numbers entered in a field in the right currency format
function formatCurrency(num) {
if(num == ''){
	return(num);
}else{
	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);
	}
}

//puts numbers in the proper format after entry
function formatNumber(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 );
}

// rounds off number sto desired decimal
function roundNumber(number) {
	var rnum = number;
	var rlength = 1; // The number of decimal places to round to
	if (rnum > 8191 && rnum < 10485) {
		rnum = rnum-5000;
		var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
		newnumber = newnumber+5000;
	} else {
		var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
	}
	return newnumber;
}

//function that opens a seperate window with the desired size and affect
function openWindow(url,w,h,tb,stb,l,mb,sb,rs,x,y){
var t=(document.layers)? ',screenX='+x+',screenY='+y: ',left='+x+',top='+y;
tb=(tb)?'yes':'no'; stb=(stb)?'yes':'no'; l=(l)?'yes':'no'; mb=(mb)?'yes':'no'; 
sb=(sb)?'yes':'no'; rs=(rs)?'yes':'no'; var x=window.open(url, 'newWin'+new Date().getTime(), 
'scrollbars='+sb+',width='+w+',height='+h+',toolbar='+tb+',status='+stb+',menubar='+mb+',links='+l+',resizable='+rs+t);
x.focus();
}


//checks to make sure only numbers are entered in a field
function data_change(field)
     {
          var check = true;
          var value = field.value; //get characters
          //check that all characters are digits, ., -, or ""
          for(var i=0;i < field.value.length; ++i)
          {
               var new_key = value.charAt(i); //cycle through characters
               if(((new_key < "0") || (new_key > "9")) && 
                    !(new_key == ""))
               {
                    check = false;
                    break;
               }
          }
          //apply appropriate colour based on value
          if(!check)
          {
               field.style.backgroundColor = "red";
          }
          else
          {
               field.style.backgroundColor = "white";
          }
     }