function trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}

var email = '_@.-';
var price = '.';
var numb = '0123456789';
var lwr = 'abcdefghijklmnopqrstuvwxyz';
var upr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
function isValid(parm,val) {
  if (parm == "") return true;
  for (i=0; i<parm.length; i++) {
    if (val.indexOf(parm.charAt(i),0) == -1) return false;
  }
  return true;
}
 
function hasPrice(parm) {return isValid(parm,numb+price);}
function hasDigits(parm) {return isValid(parm,numb);}
function isLower(parm) {return isValid(parm,lwr);}
function isUpper(parm) {return isValid(parm,upr);}
function isAlpha(parm) {return isValid(parm,lwr+upr);}
function isAlphanum(parm) {return isValid(parm,lwr+upr+numb);}
function hasEmailChars(parm) {return isValid(parm,lwr+upr+numb+email);}

function checkEmailChars(textBox)
{
	while (textBox.value.length > 0 && !hasEmailChars(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}
	textBox.value = trim(textBox.value);
}

function checkNumber(textBox)
{
	while (textBox.value.length > 0 && !hasDigits(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}
	textBox.value = trim(textBox.value);
}

function checkPrice(textBox)
{
	while (textBox.value.length > 0 && !hasPrice(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}
	textBox.value = trim(textBox.value);
}

function setPrice(val) {
	document.getElementById("lPrice").innerHTML = val;
	document.getElementById("hPrice").value = val;
}