function karakterfiltre(deger) 
{
	var yaz = new String();
	var numaralar = "0123456789.,";
	var chars = deger.value.split("");
	for (i = 0; i < chars.length; i++) 
	{
		if (numaralar.indexOf(chars[i]) != -1) yaz += chars[i];
	}
	if (deger.value != yaz) deger.value = yaz; 
}
 
function emailiKontrolEt(deg1)
{
	if(navigator.appName == 'Netscape')
	{
		kelime = document.getElementById(deg1).value;
	}
	else
	{
		theObjectReferance1 = eval('document.all.'+ deg1);
		kelime = theObjectReferance1.value;
	}
	if(kelime.indexOf('@') < 0)
		return false;
	else
	{
		afterAt = kelime.substring(kelime.indexOf('@')+1,kelime.length);
		if(afterAt.length == 0)
			return false;
		else if(afterAt.indexOf('.')<0)
			return false;
		else 
			return true;
	}
}
function emailAdresiKontrol()
{
	key = window.event.keyCode;
	ch = String.fromCharCode(key);
	if (!(ch >= '0' && ch <= '9') && !(ch >='a' && ch <='z') && (ch != '@') && (ch != '-') && (ch != '_') && (ch != '.')) 
	{
		event.returnValue = 0;
	}
	else return true;
}

function gecerliEmail(emailValue)
{
	return emailiKontrolEt(emailValue);
}

function validate(form)
{
	if(document.form.namesurname.value == '')
	{
		alert('Please enter a Name and Surname.');
		document.form.namesurname.focus();
		return false;
	}
	else if(document.form.namesurname.value == 'Name Surname')
	{
		alert('Please enter a Name and Surname.');
		document.form.namesurname.focus();
		return false;
	}
	
	else if(document.form.email.value == '')
	{
		alert('Please enter a Email Address.');
		document.form.email.focus();
		return false;
	}
	else if(document.form.email.value == 'Email')
	{
		alert('Please enter a email Address.');
		document.form.email.focus();
		return false;
	}
	else if(!gecerliEmail('email'))
	{
		alert('Please enter a valid Email Address.');
		document.form.email.focus();
		return false;
	}

	else if(document.form.phone.value == '')
	{
		alert('Please enter a Phone ');
		document.form.phone.focus();
		return false;
	}
	else if(document.form.phone.value == 'Phone')
	{
		alert('Please enter a Phone');
		document.form.phone.focus();
		return false;
	}	
	return true;
}