function somenteAlfaNumerico(e)
	{	
		if(e.keyCode == 13)
			return true;		
		
		if(e.keyCode > 32 && e.keyCode < 48)
			return false;
		
		if(e.keyCode > 57 && e.keyCode < 65)
			return false;
		
		if(e.keyCode > 90 && e.keyCode < 97)
			return false;
		
		return true;
	}


	function somenteCaracteres(e)
	{	
		if(e.keyCode == 13)
			return true;
		
		if(e.keyCode > 32 && e.keyCode < 48)
			return false;

		if(e.keyCode >= 48 && e.keyCode <= 57)
			return false;				

		if(e.keyCode > 57 && e.keyCode < 65)
			return false;
		
		if(e.keyCode > 90 && e.keyCode < 97)
			return false;
		
		return true;
	}
	
	function somenteNumeros(e)
	{
		if(e.keyCode == 13)
			return true;
				
		if(e.keyCode >= 48 && e.keyCode <= 57)
			return true;
		else
			return false;
	
	}

	function limitaTextArea(field, countfield, maxlimit) 
	{
		if (field.value.length > maxlimit) // if too long...trim it!
			field.value = field.value.substring(0, maxlimit);
		else 
			countfield.value = maxlimit - field.value.length;
	}