// Checks that given string is valid as email address
	function checkEmail(email){
	  var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	  if (filter.test(email)) return true;
	  else return false;
	} 
	var origBorder = "1px solid #c4c4c4";
	var strErrorBorder = "1px solid #990000";

// Trim functions
function Trim(TRIM_VALUE) { if(TRIM_VALUE.length < 1){ return ""; } TRIM_VALUE = RTrim(TRIM_VALUE); TRIM_VALUE = LTrim(TRIM_VALUE); if(TRIM_VALUE==""){ return ""; } else { return TRIM_VALUE; } }

function RTrim(VALUE) { var w_space = String.fromCharCode(32); var v_length = VALUE.length; var strTemp = ""; if(v_length < 0){ return ""; } var iTemp = v_length -1; while(iTemp > -1){ if(!(VALUE.charAt(iTemp) == w_space)) { strTemp = VALUE.substring(0,iTemp +1); break; } iTemp = iTemp-1; } return strTemp; }
	 
function LTrim(VALUE) { var w_space = String.fromCharCode(32); if(v_length < 1){ return""; } var v_length = VALUE.length; var strTemp = ""; var iTemp = 0; while(iTemp < v_length){ if(VALUE.charAt(iTemp) == w_space){ } else{ strTemp = VALUE.substring(iTemp,v_length); break; } iTemp = iTemp + 1; } return strTemp; }

// Contact form
function validateContactform() {

	/* Multilingual error messages */
	var errorMessages = Array;
	switch ( document.getElementById("lang").value ) {
		case "es":
			errorMessages[0] = "Por favor escriba su nombre"
			errorMessages[1] = "Por favor escriba un email valido"								
			errorMessages[2] = "Por favor escriba su email o numero de telefono"								
			break;
		default: // "en"
			errorMessages[0] = "Name is required"
			errorMessages[1] = "Please fill in valid email"
			errorMessages[2] = "Email or telephone is required"
			break; 
	};


   var elemName= document.getElementById("txtname");
   var elemEmail = document.getElementById("txtemail");
   var elemTelephone= document.getElementById("txttelephone");
   
   var boolError = false;
   var strError = "";
	   
   var vEmail = elemEmail.value;
   var vTelephone = elemTelephone.value;
   var vName = elemName.value;
  
   elemName.style.border = origBorder;
   elemEmail.style.border = origBorder;
   elemTelephone.style.border = origBorder;
		   
// Trim white-space
   vName = Trim(vName);
   vEmail = Trim(vEmail);
   vTelephone = Trim(vTelephone);
		   
// Run validation
   if(vName.length < 3) {
		strError += "" + String(errorMessages[0]) + "\n";              
		elemName.style.border = strErrorBorder;
		boolError = true;
		}
	if(vEmail.length > 0 && !checkEmail(vEmail)) {
		strError += "" + errorMessages[1] + "\n";
		elemEmail.style.border = strErrorBorder;
		boolError = true;
		} 
	if(vEmail.length == 0 && vTelephone.length == 0) {
		strError += "" + errorMessages[2] + "\n";            
		elemEmail.style.border = strErrorBorder;
		elemTelephone.style.border = strErrorBorder;
		boolError = true;
		}
	if( boolError ) alert ( strError );
		   return ! boolError;
	}