function validate_membership_form(){	var error 		= '';
	mindex 			= document.membership_form.mindex;	bdfirst_name 	= document.membership_form.bdfirst_name;	bdlast_name 	= document.membership_form.bdlast_name;	bdemail_address = document.membership_form.bdemail_address;	bdemail_address = document.membership_form.bdemail_address;	bdmobile_number = document.membership_form.bdmobile_number;	sumcheck 		= document.membership_form.sumcheck;	verification 	= document.membership_form.verification;		if(document.membership_form.mindex[document.membership_form.mindex.selectedIndex].value == '')	{		error += 'A Membership Type is required.\n';	}		if(bdfirst_name.value == '')	{		error += 'First Name is required.\n';	}		if(bdlast_name.value == '')	{		error += 'Last Name is required.\n';	}		if(bdemail_address.value == '')	{		error += 'A valid Email Address is required.\n';	}	else if(!validate_email(bdemail_address.value))	{		error += 'A valid Email Address is required.\n';	}		if(bdmobile_number.value == '')	{		error += 'Mobile Number is required.\n';	}		if(sumcheck.value != verification.value)	{		error += 'Human Verification has failed.\n';	}		if(error != '')	{		alert(error);		return false;	}		document.membership_form.submit();	return true;}