// JavaScript Document

function trim(str) {  
	while(str.charAt(0) == (" ") ) {  
		str = str.substring(1);
	}
	while(str.charAt(str.length-1) == " " )	{  
		str = str.substring(0,str.length-1);
	}
	return str;
}


function checkEmail(email) {
	//var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	var filter = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	if (!filter.test(trim(email))) {
		return false;
	}
	else {
		return true;
	}
}

function clearText(field){
	if (field.defaultValue == field.value) field.value = '';
	else if (field.value == '') field.value = field.defaultValue;
}