function emptyField(textObj) {
	var thisChar;

	if(textObj.value.length == 0) return true;

	else {

			for (var i=0; i < textObj.value.length; i++)
				{
				thisChar = textObj.value.substring(i, i+1);
				if (thisChar != ' ')
					return false;
				}
		 }

	return true;
}

function badZIPField(textObj) {
	var ValidChr="0123456789-";
	var thisChar;
	var dashCount = 0;

	for (var i=0; i < textObj.value.length; i++)
		{
			thisChar = textObj.value.substring(i, i+1);
			if ( ValidChr.indexOf(thisChar) == -1 )
				return true;
			if ( thisChar == "-" ) dashCount++;
			if ( dashCount > 1 ) return true;
		}

	return false;
}

function badEmailField(textObj) {
	var thisChar;
	var atCount = 0;
	var dotCount = 0;
	var atPos = -2;
	var DotPositionAssigned = 0;
	var atDotPos = -2;
	var lastDotPos = -2;
	var InvalidChr="!#$%&*?()<>,;:\"\\\'[]/`{}~|"

	for (var i=0; i < textObj.value.length; i++)
		{
			thisChar = textObj.value.substring(i, i+1);

			if ( InvalidChr.indexOf(thisChar) > -1 )
				return true;

			if ( thisChar == " " ) return true;

			if ( thisChar == "." )
				{
				if ( (i == textObj.value.length - 1) || (i == 0) ) return true;
				else
					{
					dotCount++;
					// check if prev char is '.'
					// dotCount > 1 condition eliminates incorrect procedure exit in case of 'n.nnnn@nnn.nn'
					if ( ((lastDotPos == i - 1) && (dotCount > 1)) || (atPos == i - 1) ) return true;
					lastDotPos = i;
					// get position of first dot after @
					if (atPos > 0 && DotPositionAssigned == false)
						{
							DotPositionAssigned = true;
							atDotPos = i;
						}
					}
				}

			if ( thisChar == "@" )
				{
				if ( (i == textObj.value.length - 1) || (i == 0) || (lastDotPos == i - 1) ) return true;
				else
					{
					atCount++;
					// get position of @
					if (atCount == 1) atPos = i;
					}
				}


			if ( atCount > 1 ) return true;
		}

	if (atCount == 1 && atDotPos < atPos) return true;

	if ( atCount == 0 ) return true;

	if ( dotCount == 0 ) return true;


	// four first character www. typos
	thisChar = textObj.value.substring(0, 4);

	switch (thisChar) {
		case "www.":
			return 101;
		case "WWW.":
			return 101;
	}


	// second level domains typos
	thisChar = textObj.value.substring(atPos,atDotPos+1);

	switch (thisChar) {
		case "@al.":
			return 103;
		case "@AL.":
			return 103;
		case "@sol.":
			return 103;
		case "@SOL.":
			return 103;
		case "@a0l.":
			return 103;
		case "@A0L.":
			return 103;
		case "@aolc.":
			return 103;
		case "@AOLC.":
			return 103;
		case "@aool.":
			return 103;
		case "@AOOL.":
			return 103;
		case "@yaho.":
			return 104;
		case "@YAHO.":
			return 104;
		case "@yoohoo.":
			return 104;
		case "@YOOHOO.":
			return 104;
		case "@excire.":
			return 105;
		case "@EXCIRE.":
			return 105;
		case "@ebtv.":
			return 106;
		case "@EBTV.":
			return 106;
	}


	// last characters top level domain typos
	thisChar = textObj.value.substring(lastDotPos+1, textObj.value.length);

	switch (thisChar) {
		case "cm":
			return 102;
		case "CM":
			return 102;
		case "con":
			return 102;
		case "CON":
			return 102;
		case "co":
			return 102;
		case "CO":
			return 102;
		case "ocm":
			return 102;
		case "OCM":
			return 102;
		case "ney":
			return 102;
		case "NEY":
			return 102;
		case "ent":
			return 102;
		case "ENT":
			return 102;
		case "comj":
			return 102;
		case "COMJ":
			return 102;
		case "com'":
			return 102;
		case "COM'":
			return 102;
	}


	// no typos found
	return false;

}

function answerNotSelectedRadio(radioObj) {
	for (var i = 0; i < radioObj.length; i++)
		{
			if (radioObj[i].checked == true) return false;
		}

	return true;
}

function answerNotSelectedDropDown(selectObj) {
	if (selectObj.selectedIndex == 0) return true;
	else return false;
}