function checkContactForm(){

	var ok = 0;
	
	var error = "";
	
	if(form1.nomc.value==""){
	
		ok = 1;
		
		error = "Introduce tu nombre\n";
		
	}
	
	if(form1.mailc.value==""){
	
		ok = 1;
		
		error += "Introduce tu e-mail\n";
		
	}	
	
	if(form1.comentari.value==""){
	
		ok = 1;
		
		error += "Introduce tu comentario\n";
		
	}	
	
	if(ok==1){
	
		alert(error);
		
	}else{
	
		form1.submit();
		
	}		
	
}