switch/case switch / case is an interesting statement, and is very useful. It is used to 'switch' between several given 'cases' within your script. It is something like a shortcut, providing execution paths for the conditions of an expression. Examine the syntax and example, given below. syntax: switch (expression) { case caseName: statements break; case caseName: statements break; default: statements EXAMPLE var inventoryList = document.form[0].itemList var neededItemList = inventoryList.options[inventoryList. selectedIndex].value switch (neededItemList) { case "neededItemOne": document.forms[0].serialNumber.value = "1386-4854" break; case "neededItemTwo": document.forms[0].serialNumber.value = "1386-8512" break; default: document.forms[0].serialNumber.value = "No Items Needed" } The above example shows a switch / case statement with two 'cases'. If the first case, 'neededItemOne' is selected by the conditions of 'neeedItemList', the value returned is the serial number, '1386-4854'. If the second case is selected, the value returned is the second serial number. If neither cases satisfy the conditions of 'neededItemList', then the default value is returned, which is 'No Items Needed'.