function countCharacter(str, char){
	var i, count = 0;
	for(i = 0; i < str.length; i++){
		if(str.charAt(i) == char)
			count++;
	}
	if(count == 1 || count == 0)
		return true;
	else
		return false;
}

function isCurrency(str){	
	if(!isNumberCurrency(str))
		return false;
	if(!countCharacter(str, '.'))
		return false;
		
	return true;
}

function isNumberCurrency(s){
	var i, isnum = true, len = s.length
	for(i = 0; i < len; i++){
		if(!isDigitCurrency(s.charAt(i)))
			isnum = false;
	}
	return isnum;
}

function isDigitCurrency(c){
	if((c=='0')||(c=='1')||(c=='2')||(c=='3')||(c=='4')||(c=='5')||(c=='6')||(c=='7')||(c=='8')||(c=='9')||(c=='.')||(c==','))
		return true;
	else
		return false;
}

function isNumber(s){
	var i, isnum = true, len = s.length
	for(i = 0; i < len; i++){
		if(!isDigit(s.charAt(i)))
			isnum = false;
	}
	return isnum;
}

function isDigit(c){
	if((c=='0')||(c=='1')||(c=='2')||(c=='3')||(c=='4')||(c=='5')||(c=='6')||(c=='7')||(c=='8')||(c=='9'))
		return true;
	else
		return false;
}

function isWeek(s){
	var i, isnum = true, len = s.length
	for(i = 0; i < len; i++){
		if(!isDigitWeek(s.charAt(i)))
			isnum = false;
	}
	return isnum;
}

function isDigitTime(c){
	if((c=='0')||(c=='1')||(c=='2')||(c=='3')||(c=='4')||(c=='5')||(c=='6')||(c=='7')||(c=='8')||(c=='9')||(c==':'))
		return true;
	else
		return false;
}

function countTimeChar(str, char){
	var i, count = 0;
	for(i = 0; i < str.length; i++){
		if(str.charAt(i) == char)
			count++;
	}
	if(count == 1)
		return true;
	else
		return false;
}

function isNumberTime(s){
	var i, isnum = true, len = s.length
	for(i = 0; i < len; i++){
		if(!isDigitTime(s.charAt(i)))
			isnum = false;
	}
	return isnum;
}

function isTime(s){
	var len = s.length
	
	if(len != 5 && len != 4)
		return false;
	if(!isNumberTime(s))
		return false;
	if(s.indexOf(':')==-1) 
		return false;
	if(s.indexOf(':')!=1 && s.indexOf(':')!=2)
		return false;
	if(!countTimeChar(s,':'))
		return false;
		
	return true;
}

function isDigitWeek(c){
	if((c=='1')||(c=='2')||(c=='3')||(c=='4')||(c=='5')||(c=='6')||(c=='7'))
		return true;
	else
		return false;
}

function trimLeft(s){
	var i;
	i = 0;
	var n;
	n = s.length;
	while((i<n)&&(s.charAt(i)==' ')) i++;
		s = s.substring(i);
	return(s);
} 

function trimRight(s){
	var n;
	n = s.length;
	var i;
	i = s.length-1;
	while((i>=0)&&(s.charAt(i)==' ')) i--;
		s = s.substring(0,i+1);
	return(s);
}

function trimAll(s){
	s = trimLeft(s);
	s = trimRight(s);
	return(s);
}  

function isEmail(strEmail){
	var intlen;
	var ctmp;
	strEmail = trimAll(strEmail);
	if(strEmail=='') return false;
	intlen=strEmail.length;
	if(intlen<5) return false;
	if(strEmail.indexOf('@')==-1) return false;
	if(strEmail.indexOf('.')==-1) return false;
	if(intlen - strEmail.lastIndexOf('.') -1 > 3) return false; 
	if((strEmail.indexOf("_")!=-1) && (strEmail.lastIndexOf("_") > strEmail.lastIndexOf("@"))) return false;
	if(strEmail.lastIndexOf(".") <= strEmail.lastIndexOf("@")+1)  return false;
	if(strEmail.indexOf("@")!=strEmail.lastIndexOf("@")) return false;
	if(intlen -1 == strEmail.lastIndexOf('.')) return false;
	if(strEmail.charAt(strEmail.indexOf('@')+1)=='.') return false;
	if(strEmail.indexOf(" ")!=-1) return false;
	if(strEmail.indexOf("..")!=-1) return false;
 
	strEmail=strEmail.toLowerCase();
	for(intcnt=0; intcnt<intlen; intcnt++){
		ctmp = strEmail.charAt(intcnt)
		if((!isDigit(ctmp))&& ((ctmp>'z')||(ctmp<'a')) && (ctmp!='-') && (ctmp!='.') && (ctmp!='@') && (ctmp!='_')) return false;
	}
	
	return true;
}