function signup_submit()
 { 
	 var message=new Array();
 
	 var email_filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	 var web_filter = /http:\/\/[A-Za-z0-9\.-]{3,}\.[A-Za-z]{3}/;

	 if(!document.signup_form.fullname.value)
	  message[message.length] = "Please enter your Full Name.";
	 if(!document.signup_form.companyname.value)
	  message[message.length] = "Please enter your Company Name.";
	 if(!document.signup_form.companyurl.value)
	  message[message.length] = "Please enter your Company URL.";  
	 else if(document.signup_form.companyurl.value=="http://")
		message[message.length] = "Please enter your Company URL.";  
	 else if(document.signup_form.companyurl.value && !web_filter.test(document.signup_form.companyurl.value))
	  message[message.length] = "Please enter a valid Company URL."; 	
	 if(!document.signup_form.emailaddress.value)
	  message[message.length] = "Please enter your Email.";
	 if(document.signup_form.emailaddress.value && !email_filter.test(document.signup_form.emailaddress.value))
	  message[message.length] = "Please enter a valid Email.";
	 if(!document.signup_form.confirmemail.value)
	  message[message.length] = "Please Confirm your Email.";
	 if(document.signup_form.confirmemail.value && !email_filter.test(document.signup_form.confirmemail.value))
	  message[message.length] = "Email Confirmation is Invalid.";

	 if(document.signup_form.emailaddress.value && document.signup_form.confirmemail.value && document.signup_form.emailaddress.value!=document.signup_form.confirmemail.value)
	  message[message.length] = "Your Email Address is not the same as the Confirm Email Address.";    

	 if(message.length >= 1) alert(message.join("\n"));
	  else document.signup_form.submit();
 }