function clearField(field, text) {
	if (field.value == text) { field.value = ""; }
	return;
}

function fillField(field, text) {
	if (isblank(field.value)) { field.value = text; }
	return;
}

function isblank(x) {
	var blank = true;
	for (i = 0; i < x.length; i++) {
		if (x.charAt(i) != ' ') { blank = false; }
	}
	return blank;
}

function isIE() {
	if (navigator.appName.indexOf("Microsoft Internet Explorer") != -1) { return true; }
	else { return false; }
}


function toggleSize(id, radio) {
  document.getElementById("size_front_load").style.display = "none";
  document.getElementById("size_rear_load").style.display = "none";
  document.getElementById("size_roll_off").style.display = "none";
  document.getElementById("size_compactor").style.display = "none";

  var e = document.getElementById(id);
	var d = "block";
  var f = document.getElementById(radio);
	if (!isIE()) {
		if (e.insertRow) { d = "table"; }
		else if (e.insertCell) { d = "table-row"; }
	}
	e.style.display = d;
  f.checked = true;
  document.getElementById("size_label").style.display = "block";
	return;
}

var win = null;

function NewWindow(mypage,myname,w,h,scroll){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings =
	'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
	win = window.open(mypage,myname,settings)
}