function check_mail(cg) {
			mail01 = /[^@]+@[A-Za-z0-9_-]+[.]+[A-Za-z]+/;
			mail02 = /[^@]+@[A-Za-z0-9_-]+[.]+[A-Za-z0-9_-]+[.]+[A-Za-z]+/;
			mail03 = /[^@]+@[A-Za-z0-9_-]+[.]+[A-Za-z0-9_-]+[.]+[A-Za-z0-9_-]+[.]+[A-Za-z]+/;

			if(mail01.test(cg.value)) return true;;
			if(mail02.test(cg.value)) return true;
			if(mail03.test(cg.value)) return true;

			return false;
		}

		function chk_pwd() {
			if(document.form.email.value == "" || document.form.email.value == "Geçersiz veya hatalı E-Mail adresi."){
				alert("E-Mail adresini yazmayı unuttunuz...");
				document.form.email.focus();
				return true;
			}
			
			if(document.form.email.value != ""){
				f_val = document.form.email;
				if(!check_mail(f_val)) { 
					alert("Geçersiz E-Mail adresi.......!"); 
					document.form.email.focus();
					return true; 
				}
				else{
					document.form.submit();
				}
			}

		}

		function clearField(field){
			if (field.value == field.defaultValue) {
				field.value = "";
			}
		}
		
		function checkField(field){
			if (field.value == "") {
				field.value = field.defaultValue;
			}
		}