function trim(inputString) {
 
   if (typeof inputString != "string") { return inputString; }
   var retValue = inputString;
   var ch = retValue.substring(0, 1);
   while (ch == " ") { 
      retValue = retValue.substring(1, retValue.length);
      ch = retValue.substring(0, 1);
   }
   ch = retValue.substring(retValue.length-1, retValue.length);
   while (ch == " ") { 
      retValue = retValue.substring(0, retValue.length-1);
      ch = retValue.substring(retValue.length-1, retValue.length);
   }
   while (retValue.indexOf("  ") != -1) { 
      retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); 
   }
   return retValue; 
}

function searchValidation() {
	df=document.forms["searchForm"];
	if (df.searchInput.value=="" || trim(df.searchInput.value).length<3) {
		alert("The keyword must contain at least 3 characters!");
		df.searchInput.focus();
		return false;
	}

	return true;
}

function newsletterValidation() {
	df=document.forms["Newsletter"];
	if (df.newsletterName.value=="") {
		alert("The name field is required!");
		df.newsletterName.focus();
		return false;
	}
	
	if (!/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test(df.newsletterEmail.value)) {
		alert("The e-mail address is not correct!");
		df.newsletterEmail.focus();
		return false;
	}

	return true;
}