function submitArt_contactForm(){
		var name = document.form_art.name.value; 
		var surname = document.form_art.surname.value;
		//var email = document.post.email.value;
		var mobile = document.form_art.mobile.value;
		var massage = document.form_art.massage.value;
 		var email = document.getElementById('email'); 

 	if(name==""){
				alert('please insert name.');
				document.getElementById('name').focus();
				return false;	
	}
 	if(surname==""){
				alert('please insert surname.');
				document.getElementById('surname').focus();
				return false;	
	}
 	if(mobile==""){
				alert('please insert mobile.');
				document.getElementById('mobile').focus();
				return false;	
	}	
 	//if(email==""){
		//		alert('please insert email.');
				//document.getElementById('email').focus();
				//return false;	
				
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email.value)) {
	alert('Please provide a valid email address.');
	document.getElementById('email').focus();
	return false;	

	}	
	 if(massage==""){
				alert('please insert massage.');
				document.getElementById('massage').focus();
				return false;	
	}
	

	document.form_art.submit();				
}


	function chkNumber(eventObj, obj){
		var keyCode;
		if (document.all)	{ 		keyCode=eventObj.keyCode	}
				  else			{		keyCode=eventObj.which		}
				if((keyCode<48 || keyCode >58) && (keyCode != 0) && (keyCode != 8)){ // Allow only integers and decimal points
					
					return false;
				  }
		return true;
		}