function doSomething(evt) 
{
    var e = !evt? window.event:evt;
    var charCode = (evt.which) ? evt.which : event.keyCode;
    if(charCode==13)
    {
        var ID=(e.target)?(e.target.id):(e.srcElement.id);
        var textBox = getObject((e.target)?(e.target.id):(e.srcElement.id));
        Calculator(textBox);
    
        if(ID=="txtPacks")
        {
            document.getElementById("txtCost").focus();
        }
        else if(ID=="txtCost")
        {
            document.getElementById("txtEcgi").focus();
        }
    }
    
}
function getObject(obj)
{
  var theObj;
  if (document.all) {
	  if (typeof obj=='string') {
		  return document.all(obj);
	  } else {
		  return obj.style;
	  }
  }
  if (document.getElementById) {
	  if (typeof obj=='string') {
		  return document.getElementById(obj);
	  } else {
		  return obj.style;
	  }
  }
  return null;
}
function Calculator(obj)
{
    var txtPacks="",txt2="",txt3="",WC="",CFC="",CPW="",MC="",CPMN="",SPM="",SPY="";
   
    txtPacks = document.getElementById("txtPacks").value;
    txtCost = document.getElementById("txtCost").value;
    txtEcgi = document.getElementById("txtEcgi").value;
    
    if(obj.id=="txtCost" && obj.value!="")
    {
        txtCost = txtCost.replace("$","");
    }
    if(obj.value!="" && !IsNumeric(obj.value))    
    {
        alert("Please Enter Numeric Values");        
        obj.value="";
        return;
    }
    
    if(txtPacks=="" || txtCost=="" || txtEcgi=="") return;
    
    
    
    WC = txtPacks*txtCost;
    CFC = (100 - txtEcgi) * 0.01 * WC;
    CPW = txtPacks * txtEcgi * 0.01;
    MC = WC * 4;
    CPMN = Math.round(((CPW * 4) + (CFC * 4))*100)/100;
    
    SPM = Math.round((MC - CPMN)*100)/100;
    SPY = Math.round(SPM * 12*100)/100;
    
    document.getElementById("divCCPM").innerHTML  = AddZero("$"+MC);
    document.getElementById("divSPM").innerHTML  = AddZero("$"+SPM);
    document.getElementById("divSPY").innerHTML  = AddZero("$"+SPY);
    
}

function IsNumeric(strString)
{
    var strValidChars = "0123456789.-",strChar=null,blnResult = true;

    //if (strString.length == 0) return false;
   
    for (i = 0; i < strString.length && blnResult == true; i++)
    {
        strChar = strString.charAt(i);
        if (strValidChars.indexOf(strChar) == -1)
        {
            blnResult = false;
        }
    }
    return blnResult;
}

function AddZero(Num) 
{
     Num = Num.replace("$","");
    var newNum = "";
    var newNum2 = "";
    var count = 0;
    
   
    
    if (Num.indexOf('.') != -1)
    {
        if (Num.indexOf('.') == Num.length-1)
        {
            Num += "00";
        }
        if (Num.indexOf('.') == Num.length-2)
        {
            Num += "0";
        }
        
        var a = Num.split("."); 
        Num = a[0];
        var end = a[1];
    }
    else {var end = "00";}  
 
     
    for (var k = Num.length-1; k >= 0; k--)
    {
        var oneChar = Num.charAt(k);
        if (count == 3)
        {        
            newNum += ",";
            newNum += oneChar;
            count = 1;
            continue;
        }
        else 
        {
            newNum += oneChar;
            count ++;
        }
   }
   
 
  for (var k = newNum.length-1; k >= 0; k--)
  {
      var oneChar = newNum.charAt(k);
      newNum2 += oneChar;
  }
   
  
   newNum2 = "$" + newNum2 + "." + end;
   return newNum2;
}

function MM_swapImgRestore() {
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() {
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) {
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() {
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}