function isEmpty(aValue){
	if (aValue==null || aValue==""){
		return true
	}
	else return false
}

function validateField(aField){
	if(isEmpty(aField.value))
		alert("You need to fill in the field")

}

function validateEmail(aValue){
	var atSign
	for (var i=0; i < aValue.length; i++){
		var oneChar = aValue.charAt(i)

		if(i==0 && oneChar=="@"){
			return false
		}

		if(oneChar=="@"){
			atSign+=1
		}
		
		if(i==aValue.length && oneChar=="@"){
			return false
		}

	}

	if(atSign=="" || atSign==null)
		return false
	else return true
}

function validateAllField(form){
var aValue, emptyCount=0
	for(var i=0; i < form.length; i++){
		if(form.elements[i].type=="select-one"){
			aValue=form.elements[i].options[form.elements[i].selectedIndex].value
		}else{
			aValue=form.elements[i].value
		}
		if(isEmpty(aValue)){
			emptyCount++
		}
	}

return emptyCount
}