var emptyChars = "\r\t\n";
var doublequotes = '"';
var singleQuotes = '\''

/****************************************************************/
// checkRequired(fieldValue, fieldName)
function checkRequired(fieldValue, fieldName)
{
	var iCount;
	if(fieldValue ==""){alert("A value is required for " + fieldName);return false;}
	if(fieldValue == null){alert("A value is required for " + fieldName);return false;}
	if(fieldValue.length == 0){alert("A value is required for " + fieldName);return false;}
	
	for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (emptyChars.indexOf(character) > -1){alert("An illegal character:'" + character + "' was found in " + fieldName);return false;}
	}
	
	for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (doublequotes.indexOf(character) > -1){alert("Double quotes are not allowed in " + fieldName);return false;}
	}	
	
		for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (singleQuotes.indexOf(character) > -1){alert("Apostrophes are not allowed in " + fieldName);return false;}
	}
    return true;
}

/****************************************************************/
// checkBlank(fieldValue, fieldName)
function checkBlank(fieldValue, fieldName)
{
	var iCount;
	if(fieldValue ==""){return false;}
	if(fieldValue == null){return false;}
	if(fieldValue.length == 0){return false;}
	
	for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (doublequotes.indexOf(character) > -1){alert("Double quotes are not allowed in " + fieldName);return false;}
	}
			
    return true;
}

/****************************************************************/
// checkRequiredLink(fieldValue, fieldName)
function checkRequiredLink(fieldValue, fieldName)
{
	var iCount;
	if(fieldValue ==""){alert("A value is required for " + fieldName);return false;}
	if(fieldValue == null){alert("A value is required for " + fieldName);return false;}
	if(fieldValue.length == 0){alert("A value is required for " + fieldName);return false;}
	if(fieldValue.length <= 7){alert("A complete URL is required for " + fieldName);return false;}
	
	for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (emptyChars.indexOf(character) > -1){alert("An illegal character:'" + character + "' was found in " + fieldName);return false;}
	}
	
	for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (doublequotes.indexOf(character) > -1){alert("Double quotes are not allowed in " + fieldName);return false;}
	}	
	
		for (iCount = 0; iCount < fieldValue.length; iCount++)
	{
		var character = fieldValue.charAt(iCount);
		if (singleQuotes.indexOf(character) > -1){alert("Apostrophes are not allowed in " + fieldName);return false;}
	}
    return true;
}

/****************************************************************/
//showWindow(URL, Width, Height)
function showWindow(URL, Width, Height)
{

	var Win = window.open(URL,"",'width=' + Width + ',height=' + Height + ',resizable=yes,scrollbars=yes,menubar=no,status=no' );

}

/****************************************************************/
//isEmail(fieldValue,fieldName)
function isEmail(fieldValue,fieldName)
{
	//'@' is in the string, but not in the first position
	//there is only one '@' symbol
	//there is a '.' in the 3rd or 4th position from the right
	//there is not a '@' followed by a '.'

	if(fieldValue.indexOf("@")<=0){return false;}
	if(fieldValue.indexOf("@") - fieldValue.lastIndexOf("@")!= 0){return false;}
	if(((fieldValue.length - fieldValue.lastIndexOf("."))!=4)&&((fieldValue.length - fieldValue.lastIndexOf(".")!=3))){return false;}
	if(fieldValue.indexOf(".",fieldValue.indexOf("@")) - fieldValue.indexOf("@") == 1){return false;}
	return true;
}



function toggleDisplay(element){
	if (element.style.display == 'none')
		{
		element.style.display = 'block';
		}
	else
		{
		element.style.display = 'none';
		}
}