function isEmpty(input) {
		return (!input || input == "" || input == null || input == "null");
	}
	function verifySearchInput(inputName) {
	  var inputEl = document.getElementById(inputName);
	  if (isEmpty(inputEl.value)) {
	  	  alert("Please enter a search value.");
	  }
	}
	function getValue(elementId) {
		var el = document.getElementById(elementId);
		if (el) {
			return el.value;
		}
		return null;
	}
	function getSelectedValue(selectId) {
		var selectEl = document.getElementById(selectId);
		var index = selectEl.selectedIndex;
		var selectedValue = "";
		if (index != -1 && !isEmpty(selectEl.options[index].value)) {
			selectedValue = selectEl.options[index].value;
		}
		return selectedValue;
	}
	function setValue(elementId, value) {
		var el = document.getElementById(elementId);
		if (el) {
			el.value = value;
		}
	}
	function disableInput(inputEl) {
		inputEl.disabled = true;
	}
	function submitForm(methodValue, formIndex) {
		if (!isEmpty(methodValue)) {
			var methodEl = document.getElementById("method");
			methodEl.value = methodValue;
		}
		var index = 0;
		if (!isEmpty(formIndex)) {
			index = formIndex;
		}
		var formEl = eval("document.forms[" + index + "]");
		formEl.submit();
	}
	function selectionVerified(selectId, labelStr) {
		var selectEl = document.getElementById(selectId);
		var selected = false;
		if (selectEl) {
			selected = selectEl.selectedIndex != -1;
		}
		if (!selected) {
			if (labelStr) {
				alert("Please select a " + labelStr + ".");
			} else {
				alert("Please make a selection.");
			}
		}
		return selected;
	}
	function deleteConfirmed(label) {
		return confirm("Are you sure you want to delete the selected " + label + "?");
	}
	function selectAllOptions(selectId) {
		var selectEl = document.getElementById(selectId);
		for (var i = 0; i < selectEl.options.length; i++) {
			selectEl.options[i].selected = true;
		}
	}
	function moveOption(selectFromId, selectToId) {
		  var selectFrom = document.getElementById(selectFromId);
		  var selectTo = document.getElementById(selectToId);
		  var index = selectFrom.selectedIndex;
		  if (index == -1) {
		  	return;
		  }
		  var selectedOption = selectFrom.options[index];
		  var movedOption = new Option(selectedOption.text, selectedOption.value);
		  selectFrom.options[index] = null;
	 	  var newIndex = selectTo.length;
		  selectTo.length = newIndex + 1;
		  selectTo.options[newIndex] = movedOption;
		  selectFrom.selectedIndex = -1;
		  selectTo.selectedIndex = -1;
	}
	function moveOptions(selectFromId, selectToId) {
		var selectFrom = document.getElementById(selectFromId);
		var selectTo = document.getElementById(selectToId);
		var selectedIndices = new Array();
	    for (var i = 0; i < selectFrom.options.length; i++) {
		   if (selectFrom.options[i].selected) {
		   		selectedIndices[i] = "Y";
		   	    var selectedOption = selectFrom.options[i];
				var movedOption = new Option(selectedOption.text, selectedOption.value);
				var newIndex = selectTo.length;
				selectTo.length = newIndex + 1;
				selectTo.options[newIndex] = movedOption;
		   }
		}
	    for (var i = selectedIndices.length - 1; i >= 0; i--) {
			if ("Y" == selectedIndices[i]) {
				selectFrom.options[i] = null;
			}
		}
	  	selectFrom.selectedIndex = -1;
	 	selectTo.selectedIndex = -1;
	}
	
	XmlHttp = function() {
		var xmlHttp = null;
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {			
			try {
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (E) {
				xmlHttp = false;
			}
		}
		if (!xmlHttp && typeof XMLHttpRequest!='undefined') {
			try {
  				xmlHttp = new XMLHttpRequest();
			} catch (e) {
				xmlHttp = false;
			}
		}
		return xmlHttp;
	}
	function sendAjaxRequest(url) {
		var xmlHttp = new XmlHttp();
		xmlHttp.open("POST", url, true);
 		xmlHttp.onreadystatechange=function() {
 			handleResponse(xmlHttp);
  		}
		xmlHttp.send(null);
	}
	function handleResponse(xmlHttp) {
 		if (xmlHttp.readyState==4) {
 			var responseText = xmlHttp.responseText;
 			//alert(responseText);
   			eval(responseText);
  		}
	}
	function clearSelect(selectId, blankOptionText, blankOptionValue) {
		var selectEl = document.getElementById(selectId);
		var startIndex = 0;
		if (blankOptionText) {
			var option = new Option();
			option.value = blankOptionValue;
			option.text = blankOptionText;
			selectEl.options[0] = option;
			startIndex++;
		}
		for (var i = startIndex; i < selectEl.options.length; i++) {
			selectEl.options[i] = null;
		}
		selectEl.options.length = blankOptionText ? 1 : 0;
	}
	function populateEquipmentCities(blankOptionText, updateEquipmentList) {
		var selectedState = getSelectedValue("states");
		sendAjaxRequest("/OnlineServices/equipment?method=populateCities&state=" + selectedState + "&blankOptionText=" + blankOptionText + "&updateList=" + updateEquipmentList);
	}
	function populateEquipmentTerminals(blankOptionText, updateEquipmentList) {
		var selectedCity = getSelectedValue("cities");
		sendAjaxRequest("/OnlineServices/equipment?method=populateTerminals&city=" + selectedCity + "&blankOptionText=" + blankOptionText + "&updateList=" + updateEquipmentList);
	}
	function updateEquipmentList() {
		var selectedTerminal = getSelectedValue("terminals");
		sendAjaxRequest("/OnlineServices/equipment?method=updateEquipmentList&terminal=" + selectedTerminal);
	}
	function deleteTableRows(tableId, startIndex, endIndex) {
		var tableEl = document.getElementById(tableId);
		for (var i = endIndex; i >= startIndex; i--) {
			tableEl.deleteRow(i);
		}
	}
	function hideTableRows(tableId, startIndex) {
		var tableEl = document.getElementById(tableId);
		for (var i = startIndex; i < tableEl.rows.length; i++) {
			tableEl.rows[i].style.display = 'none';
		}
	}
	function selectEquipment(tableRow) {
		tableRow.className = 'selectedRow';
		setValue('description', tableRow.cells[0].innerHTML);
		deselectEquipmentRows(tableRow, 2);
	}
	function deselectEquipmentRows(tableRow) {
		var standardTable = document.getElementById('standard');
		for (var i = 2; i < standardTable.rows.length; i++) {
			if (standardTable.rows[i] != tableRow) {
				standardTable.rows[i].className = i % 2 == 0 ? "listEvenRow" : "listOddRow";
			}
		}
		var specialTable = document.getElementById('special');
		for (var i = 2; i < specialTable.rows.length; i++) {
			if (specialTable.rows[i] != tableRow) {
				specialTable.rows[i].className = i % 2 == 0 ? "listEvenRow" : "listOddRow";
			}
		}
	}
	function editEquipment() {
	  if (isEmpty(getValue('terminals')) && isEmpty(getValue('description'))) {
	  	alert("Select a terminal and the equipment item to edit.");
	  } else if (isEmpty(getValue('terminals'))) {
	  	alert("Select a terminal.");
	  } else if (isEmpty(getValue('description'))) {
	  	alert("Select the equipment item to edit.");
	  } else {
	  	submitForm('editEquipment');
	  }
	}
	function deleteEquipment() {
	  if (isEmpty(getValue('terminals')) && isEmpty(getValue('description'))) {
	  	alert("Select a terminal and the equipment item to delete.");
	  } else if (isEmpty(getValue('terminals'))) {
	  	alert("Select a terminal.");
	  } else if (isEmpty(getValue('description'))) {
	  	alert("Select the equipment item to delete.");
	  } else {
	  	if (confirm("Are you sure you want to delete the selected equipment item?")) {
	  		submitForm('deleteEquipment');
	  	}
	  }
	}
	function selectTerminal(tableRow) {
		tableRow.className = 'selectedRow';
		setValue('terminalNum', tableRow.cells[0].innerHTML);
		deselectTerminalRows(tableRow, 1);
	}
	function deselectTerminalRows(tableRow, startRow) {
		var terminalTable = document.getElementById('terminals');
		for (var i = startRow; i < terminalTable.rows.length; i++) {
			if (terminalTable.rows[i] != tableRow) {
				terminalTable.rows[i].className = i % 2 == 0 ? "listEvenRow" : "listOddRow";
			}
		}
	}
	function editTerminal() {
	  if (isEmpty(getValue('terminalNum'))) {
	  	alert("Select a terminal to edit.");
	  } else {
	  	submitForm('editTerminal');
	  }
	}
	function deleteTerminal() {
	  if (isEmpty(getValue('terminalNum'))) {
	  	alert("Select a terminal to delete.");
	  } else {
	  	submitForm('deleteTerminal');
	  }
	}
	function updateTerminalList() {
		var selectedCity = getSelectedValue("cities");
		sendAjaxRequest("/OnlineServices/terminals?method=updateTerminalList&city=" + selectedCity);
	}
	function populateTerminalCities(blankOptionText, updateTerminalList) {
		var selectedState = getSelectedValue("states");
		sendAjaxRequest("/OnlineServices/terminals?method=populateCities&state=" + selectedState + "&blankOptionText=" + blankOptionText + "&updateList=" + updateTerminalList);
	}
	function validateTerminalNumber() {
		var terminalNumber = document.getElementById("terminalnumber");
		sendAjaxRequest("/OnlineServices/terminals?method=validateTerminalNumber&terminalNumber=" + terminalNumber.value);
	}