function decrement_value(id_input, min_value){
	var input = document.getElementById(id_input);
	if(input.value > min_value){ input.value--; }
	if(input.value == ''){ input.value = min_value; }
}

function increment_value(id_input, max_value){
	var input = document.getElementById(id_input);
	if(input.value < max_value){ input.value++; }
	if(input.value == ''){ input.value = min_value; }
}

function toBeBetween(input, min_value, max_value){
	if(parseInt(input.value) > max_value){ input.value = max_value; }
	if(parseInt(input.value) < min_value){ input.value = min_value; }
}

function limitText(limitField, maxVal){
	var maxValLen = (maxVal + '').length;
	
	if(parseInt(limitField.value) < 1){
		limitField.value = 1;
	}
	
	if(limitField.value.length >= maxValLen){
		limitField.value = limitField.value.substring(0, maxValLen);
		if(limitField.value > maxVal){
			limitField.value = limitField.value.substring(0, maxValLen - 1);
		}
		if(limitField.value == maxVal){
			limitField.value = maxVal;
		}
	}
}

function numbersonly(e, decimal){
	var key;
	var keychar;

	if(window.event){
		key = window.event.keyCode;
	}else if(e){
		key = e.which;
	}else{
		return true;
	}
	
	keychar = String.fromCharCode(key);
	
	if((key == null) || (key == 0) || (key == 8) ||  (key == 9) || (key == 13) || (key == 27)){
		return true;
	}else if((("0123456789").indexOf(keychar) > -1)){
		return true;
	}else if(decimal && (keychar == ".")){
		return true;
	}else{
		return false;
	}
}