function validate_required(field,alerttxt)
{
	with (field)
	{
		if (value==null||value==""){
			alert(alerttxt);
			field.focus();
			return false;
		}
		else {
			return true
		}
	}
}

function validate_email(field,alerttxt)
{
	with (field)
	{
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2) {
			alert(alerttxt);
			field.focus();
			return false;
		}
		else {
			return true;
		}
	}
}

function validate_number(field,alerttxt)
{
	with (field)
	{
		var stripped = field.value.replace(/[\(\)\.\-\ ]/g, '');    
		if (isNaN(parseInt(stripped))) {
			alert(alerttxt);
			field.focus();
			field.select();
			return false;
		}
		else{
			return true;
		}
	}
}

function validate_form(thisform)
{
	with (thisform)
	{
		if (validate_required(txtName,"Please enter your name.")==false){
			return false;
		}
		if (validate_required(txtEmail,"Please enter your email address.")==false){
			return false;
		}
		if (validate_email(txtEmail,"Please enter a valid e-mail address!")==false){
			return false;
		}	
		if (validate_required(txtMessage,"Please enter your message.")==false){
			return false;
		}					
	}
}