function check_login(oForm) {
			if (oForm.tboEmail.value.length == 0) {
				oForm.tboEmail.focus();
				alert("Please enter your email!");
				return (false);
			}
			else if (check_email(oForm.tboEmail.value) == false) {
				oForm.tboEmail.focus();
				alert("Your email is invalid!");
				return (false);
			}
			else if (oForm.tboPassword.value.length == 0) {
				oForm.tboPassword.focus();
				alert("Please enter your password!");
				return (false);
			}

		}
		
		function check_email(sEmail) {
			var len = sEmail.length;
			if (len==0) return (false);
			for(var i=0;i<len;i++) {
				var c= sEmail.charAt(i);
				if (!((c>="A"&&c<="Z")||(c>="a"&&c<="z")||(c>="0"&&c<="9")||(c=="-")||(c=="_")||(c==".")||(c=="@"))) {
					return (false);
				}
			}
			if ((sEmail.indexOf("@")==-1)||(sEmail.indexOf("@")==0)||(sEmail.indexOf("@")==(len-1))) {
				return (false);
			}
			if((sEmail.indexOf("@")!=-1)&&(sEmail.substring(sEmail.indexOf("@")+1,len).indexOf("@")!=-1)) {
				return (false);
			}
			if((sEmail.indexOf(".")==-1)||(sEmail.indexOf(".")==0)||(sEmail.lastIndexOf(".")==(len-1))) {
				return (false);
			}
		}