// Valida tamanho do texto.
function verificaTamanho(target, maximo, cont)
{
	var strLen = 0;
	var contador = cont;
	
	if( target.value != ""  )
	{
		strLen = strLen + target.value.length;
	}
	
	if( strLen == 1 && target.value.substring(0,1) == " " )
    {
        target.value = "";
		strLen = strLen - 1;
    }
    
    if( strLen > maximo )
	{
		target.value = target.value.substring(0,maximo);
		strLen = strLen - 1;
	}
		
	contador.value = maximo - strLen;			
}