function validate_button(form){		
			var message = "Please fill missing fields: "; 
		
			if (form.email.value=="") { 
				message = message + "\n Email"; 
			}
			if(form.email.value.indexOf("@")==-1){
				message = message + "\n Email missing @";	
			}
			if(form.email.value.indexOf(".")==-1){
				message = message + "\n Email missing dot (.)";	
			}
			if (message == "Please fill missing fields: ") { 
				return true; 
			
			} else { 
				alert(message);
				//this.focus();
				return false; 
			}				
		};