function checkContactForm(){
	var form1=document.getElementById('form1');
	var yourName=form1.yourName.value;
	var phoneNumber=form1.phoneNumber.value;
	var interest=form1.interest.value;
	var comments=form1.comments.value;
	
	var filled=false;
	var errors=false;
	var errorM="The following fields are required:\n\n";
	
	if(yourName==""){ errors=true; errorM += " - Your name\n"; }
	if(phoneNumber==""){ errors=true; errorM += " - Phone number\n"; }
	if(interest==""){ errors=true; errorM += " - Interest\n"; }
	if(comments==""){ errors=true; errorM += " - Comments\n"; }
	
	if(errors){
		alert(errorM);
		return false;
		}
	else {
		return true;
		}
	}