function checkForm()
{

   cname    = document.getElementById("contact_name");
   ccompany = document.getElementById("company_name");
   ctitle   = document.getElementById("position_title");
   caddress = document.getElementById("street_address_1");
   ccity    = document.getElementById("city");
   czipcode = document.getElementById("zip_code");
   ccountry = document.getElementById("country");
   cphone   = document.getElementById("phone");
   cemail   = document.getElementById("email");
   
   if(document.body.id == "Workshops_Application_Form") {
   	cworkshop = document.getElementById("workshop");
   	if(trim(cworkshop.value) == '') {
   		alert('Please choose the workshop you wish to attend');
   		cworkshop.focus();
   		return false;
   	}
   }

   if(trim(cname.value) == '') {
      alert('Please enter your name');
      cname.focus();
      return false;
   } else if(trim(ccompany.value) == '') {
      alert('Please enter your company name');
      cemail.focus();
      return false;
   } else if(trim(ctitle.value) == '') {
      alert('Please enter your title');
      cemail.focus();
      return false;
   } else if(trim(caddress.value) == '') {
      alert('Please enter your address');
      cemail.focus();
      return false;
   } else if(trim(ccity.value) == '') {
      alert('Please enter your city');
      cemail.focus();
      return false;
   } else if(trim(czipcode.value) == '') {
      alert('Please enter your zip code');
      cemail.focus();
      return false;
   } else if(trim(ccountry.value) == '') {
      alert('Please choose a country of residence');
      cemail.focus();
      return false;
   } else if(trim(cphone.value) == '') {
      alert('Please enter your phone contact number');
      cemail.focus();
      return false;
   } else if( (trim(cemail.value) == '')  || (!isEmail(trim(cemail.value))) ) {
      alert('Email address is not valid');
      cemail.focus();
      return false;
   } else {
      cname.value    = trim(cname.value);
      cemail.value   = trim(cemail.value);
      return true;
   }
}

/*
Strip whitespace from the beginning and end of a string
Input : a string
*/
function trim(str) {
   return str.replace(/^\s+|\s+$/g,'');
}

/*
Check if a string is in valid email format. 
Returns true if valid, false otherwise.
*/
function isEmail(str) {
   var regex = /^[-_.a-z0-9]+@(([-_a-z0-9]+\.)+(ac|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|cat|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|im|il|in|info|int|io|iq|ir|is|it|jm|jo|jobs|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|mobi|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|tl|tm|tn|to|tp|tr|travel|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;
   return regex.test(str);
}