function check_select()
																							{																						
																								if(window.document.myform.firstname.value=="")
																									{
																										alert("Please enter your first name");
																										window.document.myform.firstname.focus();
																										return false;
																									}
																								if(window.document.myform.lastname.value=="")
																									{
																										alert("Please input last name");
																										window.document.myform.lastname.focus();
																										return false;
																									}	
																								if(window.document.myform.email.value=="")
																									{
																										alert("Please input email address");
																										window.document.myform.email.focus();
																										return false;
																									}
																								if(window.document.myform.email.value!="")
																									{
																										txt=window.document.myform.email.value;
																										if (txt.indexOf("@")<3)
																										{
																											alert("Eror. Email is wrong.")							
																											window.document.myform.email.select();
																											return false;
																										}
																									}
																								if(window.document.myform.message.value=="")
																									{
																										alert("Please input message");
																										window.document.myform.message.focus();
																										return false;
																									}																																																																																						
																								}