function checkEmailForm(form)
{
	var cemail;
	with(form)
   	{
		cemail   = txt_email;
   	}
   	if(trim(cemail.value) == '')
	{
	      alert('Please enter your email');
	      cemail.focus();
	      return false;
   	}
   	else if(!isEmail(trim(cemail.value)))
	   {
	      alert('Your email address is not valid');
	      cemail.focus();
	      return false;
   	}
   	else
	   {
	      cemail.value   = trim(cemail.value);
	      return true;
   	}
}

function checkContactForm(form)
{
   var cname, corg, cemail, cverify;

   with(form)
   {
      cname    = txt_name;
      corg    = txt_organization;
      cemail   = txt_email;
      cverify = txt_addem;
   }

   if(trim(cname.value) == '')
   {
      alert('Please enter your name');
      cname.focus();
      return false;
   }
   else if(trim(corg.value) == '')
   {
      alert('Please enter the name of your organization');
      corg.focus();
      return false;
   }
   else if(trim(cemail.value) == '')
   {
      alert('Please enter your email');
      cemail.focus();
      return false;
   }
   else if(!isEmail(trim(cemail.value)))
   {
      alert('Your email address is not valid');
      cemail.focus();
      return false;
   }
   else if(trim(cverify.value) == '')
   {
      alert('Please answer the verification question.');
      cverify.focus();
      return false;
   }
   else
   {
      cname.value    = trim(cname.value);
      cemail.value   = trim(cemail.value);
      corg.value = trim(corg.value);
      return true;
   }

}

function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}


function isEmail(str)
{
	//alert(trim(str));
	//var regex = /.*+@(([-_a-z0-9]+\.)+(ad|ae|aero|af|ag| ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg| bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg| ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk| dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb| gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn| hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg| kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly| ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum| mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu| nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa| re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st| su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz| ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za| zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])) $/i;
	var regex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return regex.test(str);
}