// JavaScript Document
function MM_swapImgRestore() { //v3.0
  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() { //v3.0
  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) { //v4.01
  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() { //v3.0
  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];}
}

function preloadImages() {
	MM_preloadImages('hi.jpg')
}

function setFocus(ctl) {
	if(MM_findObj(ctl) != null) {
		MM_findObj(ctl).focus();
	}
}	
function MM_displayStatusMsg(msgStr) { //v1.0
  status=msgStr;
  document.MM_returnValue = true;
}
function modifyQtyCombo(fld,qty) {
	var obj = MM_findObj(fld);
	var newQty = 0;
	var currVal = obj[obj.selectedIndex].value;
	
	if(!isNumeric(currVal)) {
		currVal = 0;
	}

	newQty = (Number(currVal) + Number(qty));
	if(newQty > 0 && newQty < 13) {
		obj.selectedIndex = newQty;		
	} else if(newQty==13) {
		obj.selectedIndex = 12;
	} else {
		obj.selectedIndex = 0;
	}
	calc();
}
function modifyQty(fld,qty) {
	var obj = MM_findObj(fld);
	var newQty = 0;
	var currVal = obj.value;
	
	if(!isNumeric(currVal)) {
		currVal = 0;
	}

	newQty = (Number(currVal) + Number(qty));
	if(newQty > 0) {
		obj.value = newQty;		
	} else {
		obj.value = '';
	}
}
function isNumeric(sText) {
	var validChars = '0123456789';
	var isNumber = true;
	var Char;
	for (i = 0; i < sText.length && isNumber == true; i++) { 
		Char = sText.charAt(i); 
		if (validChars.indexOf(Char) == -1) {
			isNumber = false;
		}
	}
	return isNumber;
}